My original feeling that people are going off the deep end in criticising this move hasn’t changed at all. Why does my ATV engine pop when I give it throttle? This is the beginning of a very detailed question one of our readers asked the ATV AnswerMan. Looks like the popular concensus is to richen up the pilots. 003" bigger. Hence anti-lag. Backfiring is caused by the ignition of fuel and air in the INTAKE stream causing it to fire through the CARB. The regulator is a critical piece and should to be matched to the type of fuel delivery system and the fuel pump that you are using or plan to use. It starts right up but after about 10 minutes it just shuts off. I dont ride a lot. My gas is good and I'm running a 185 main jet. Add in a lean stumble through when opening the throttle (no accelerator pump) the engine pre fires and forces a pre detonation back through the crankcase and. In each of the 3 instances, I checked the products of combustion with my gas detector and in all 3, I found 0% lel natural gas (perfect). The opening three episodes of Dirty John: The Betty Broderick Story laid out first the high emotions involved in Betty and Dan Broderick’s contentious split, then the origins of their. Move to the using a 4 stroke machine. For most of us, consistently eating less than the calorie minimum is a bad idea because it leads to a: Slower metabolism and lousy side effects. G/O Media may get a commission Save 33% on CBD Gummies, Energy Shots, and Yes, UNICORN JERKY in Sunday Scaries' 4th of July Sale. Enrichening The CV Jetting. I am religious about checking my tires. Posted by Larry williams on Dec 07, 2012. My new 900 was delivered last week. you should be able to turn it with your hand. Don't know if yours is a '12, but mine does the same thing on long coasts down a grade, especially when you let off after getting to 40 mph or so. Mine even smoked alot at start up. Let others know if this worked for you. This is a very common problem with cars today and the fix can be very easy and often times performed at home. If your ATV doesn't turn over when the ignition is engaged, or only tries lazily to do so, your battery may be low on juice. the engine ran fine on initial start up but original carb leaked gas. i have a used mule and it had very little hours on it but its a 2003 - sat for a long time and i thought i had. Proper opening of throttle and clean carburetor. Alternator issues. My parents gave me money for As on my report card throughout middle school, but that was mostly just to give me a little spending money, because I would have gotten decent grades on my own anyways. The engine's intake system depends on being completely sealed and free from leaks. Big_country, Aug 4, 2008 #8. is there such a thing as an anti backfire valve. Honda foreman backfiring - Motorcycles give my four wheeler gas when i hold the throttleand then let off of it then pull start it it backfires but then will. I agree that a good tune job will get rid of most ,if not all the popping on about 90% of the quads. Golf Cart Forum for Electric Golf cars, Golf Cart Lift Kits and Custom Golf Cart Parts and Accessories. But after it warmed up it would hardly do it. In my how-to video I will walk you through the basic principles and fundamentals of what you are adjusting and how it will impact your bike's response. Took a short ride around the block to the grocery store without a helmet (i know, shut up) and realized just how loud the pops are. Sometimes they come loose. If I give it a LITTLE gas while slowing down, and don't just let off completelyit won't do it. tighten the screw in and it should up the gas flow allowing it to idle. the reduced back pressure allows the gas to escape further down stream, and the rich condition is caused by goin from WOT to idle near-instantly. The noise indicates that the vehicle is out of tune and is performing poorly. There is nothing you can do to prevent this obviously because it is the gas station’s responsibility. with different carb (which came off good running car) has backfire through exhaust when you give it gas took the valve cover off got piston up to TDC both valves closed set distributor to #1 position checked plug wires 3x's or more for correct order. Last Updated on April 16, 2020. Get shopping advice from experts, friends and the community! I just replaced the connecting rod and put it all back together. Of course, I will check back with the repair shop, but I would really appreciate some advice and a bit of a heads up on the potential problem and cost. Sears Parts Direct. There are a few issues with your unloading valve that causing stalling the engine pump. I'm hoping to get some tips/opinions. My O2 sensor is new (from my smog test fiasco about six months ago). For most of us, consistently eating less than the calorie minimum is a bad idea because it leads to a: Slower metabolism and lousy side effects. POSSIBLE SOLUTION. Engine backfires can be produced by a vacuum leak, bad timing, problems in the ignition system, a faulty sensor, an exhaust leak, or some other system fault. The bait seems weighted suffi. i always set it to off when i leave my bike in the back yard incase someone comes by trying to. so its a bit louder. Better still, you can choose to receive email messages on all Honda products or just those you're most interested in. Get shopping advice from experts, friends and the community! I just replaced the connecting rod and put it all back together. It runs fine but whenever I let go of the gas for more than a second it'll start to die. I'm looking for some help/advice with my 2010 RZR S. Delayed ignition. This problem occured almost the whole 12 miles back to my home. Drilled the main jet. Let's know about 5 reasons that cause car backfire. It takes a few s. This strikes me really weird. It can float over the hole the gas has to flow through and block the fuel flow. G/O Media may get a commission Save 33% on CBD Gummies, Energy Shots, and Yes, UNICORN JERKY in Sunday Scaries' 4th of July Sale. What Cause a Car to Backfire: 5 Reasons behind the Problem. It's only a couple years old and barely used. Tightening jet the fell out helped. One of my friends just bought a 2004 YZ450F and his is backfiring a lot too. There is nothing you can do to prevent this obviously because it is the gas station’s responsibility. Is this normal or due to inferior pipes. plug looks good. Every time i let go of the accelerator, I get a loud backfire. Once you get this set right and tightened, do it for the other adjustment screw on the other rocker arm. Check float shaft for wear and float for leaks or dents. Is backfire bad for your ATV? How big or bad the backfire is, is usually based on how loud the combustion sound is. You might find a chain of commands online for how to prime it. The exhaust is hot and ignites these fumes, thus you get a loud "pop" thru the exhaust. you should do as i mentioned in my first post: 1. It has done it ever since I bought it. Maybe the new exhaust pipes and muffle make it seem louder. Want Answer 0. Backfire is a condition described as a loud bang, poof, explosion, etc. Also when I’m riding it at about full gas and high revs, when I let go off the gas the bike is a bit nervous, makes a bit of a different sound and likes to kick forward a bit as if there is still some extra gas that ignites in the cylinder even though there shouldn’t be any (if that makes any sense written like this). I am just Curious, I was out riding in my yard today for about an hour or less and My LTR kept backfiring, I dont have many mods so it shouldnt be running lean, I have a YOSHI RS5 slip-on, Cherry bomb and lid off, what would cause it to backfire? it seemed to happen mostly between shifts, and it would usually be one or two pops. In some cases the exhaust also spits out a partial flame. Now the popping and backfiring is back at mid-throttle. the secret world of the fuel screw At up to a quarter-turn, your four-stroke’s carburetor slide doesn't process enough oxygen to effectively atomize fuel through the main circuit. Jump to Latest Follow Are you sure it is backfiring, and not the back pressure from the exhaustmine will pop every once in a while but it does not backfireusally in low gear after going fast and letting it roll to a stop. Delayed ignition. Has new plug and decent spark. You can start to rev it up and o ce it hits a certain RPM it hangs there and. so its a bit louder. The reason eight Yamaha golf cart may backfire when slowing down, is the air to fuel mixture needs adjustment. It doesnt backfire on deceleration or anything, just right after it gets turned off Also, the throttle sticks if your idling and you give it some gas, it will usually return to normal after 5 seconds otherwise it just stays the same. When you suddenly close the throttle, the incoming air is choked off and the closed throttle also causes the bike to return to idle on the very lean idle circuit. No real mods (K/N, Flowmaster exhaust). its about 10 mins of backfiring thru carb, stalling, spraying gas out of the carb when stalls and shooting flames out thru the carb. When choosing a fuel pressure regulator for your ride, you need to take into consideration several factors. The backfire is through the exhaust not the carb and happen when the throttle is opened up from idle (roughy 800 rpms) This started to happen after I changed the plugs, plug wires and removed the header to get the plugs. High flow air cleaners, agressive cams and very open, free flowing exhaust system all. If the tank and hose are fine, narrow down the problem a bit more. Any help you folks can give I'll pass on to him. The usual cause is exhaust leaks where air is getting in between the exhaust manifold and cat. Take a look for holes. What it is, is incomplete combustion, fuel is left over, and shot into the exhaust pipes. No ifs ands or buts, that’s what causes it. The detailed answer: Ask five gearheads or mechanics their opinion of starting fluid, and you might get five different answers. I'm running reverse megaphones with baffles. Testing and checking can. I do notice there is a small exhaust leak where the muffler slides onto the pipe, do you think this leak could effect the backfire problem?. Has new plug and decent spark. Poor quality of fuel is the main reason why fuel tanks in vehicles end up with dirty gas. Place your hand over the end to aid in fuel flow to the carburator. I replaced my valve seals, but that did not help the smoke. Backfires in Exhaust. If starting/idling/backfiring on throttle let-off problems surface, pilot screw adjustment may solve them. Add in a lean stumble through when opening the throttle (no accelerator pump) the engine pre fires and forces a pre detonation back through the crankcase and. It takes a few s. A Hole in the Exhaust—If there’s a hole in your exhaust system (muffler or tailpipe) near the engine, this would cause backfire. When the spark is intermittent, it can cause a buck and make your car backfire when fuel builds in the cylinders. The air cut-off valve is expensive (about $70) and should be replaced after all other suspects tested have failed. It gets page views, but it’s not very rational IMO. Here is a link to order any parts you need. If gas rushes out of the petcock, then the restriction is in your carburetor. I solved a similar deceleration backfire on a CH250 by removing the 112 (lean) main jet on a CH 250 and using a 115 or 118. If the tube is smoky, check for seized piston ring. But it can be bad for two-stroke or diesel engines. 003" bigger. It started popping/backfiring when I would let off the gas, mostly on a downhill a few months ago. It's that other 10%, that no matter what they try with jets, needles or. if you didn't adjust it (sounds like you didn't) then just let it be. It also has Honda 400 EX backfires - Off-Road Forums & Discussion Groups. Most China ATV models have a safety feature that requires you to either squeeze or step on a brake lever to start them. Drilled the main jet. The backfiring can be fixed by going to a larger slow or pilot jet, in this example the next size up is 42. A good mechanic should be able to fix this with adjustments if you have a new carb. Generally I am very impressed with the machine. First, take the gas line off the carb and turn the petcock on to see if gas is flowing to the carb. Ask: We have a Tao Tao 150 and the thing cost almost $2,100. I have checked the timing and it is set at 5* with the vacuum lines removed and plugged, it was recently tuned up with all new ignition stuff and the carb is brand new. I have tried out a new carburetor also. The compression of the engine should force air past your finger. I don’t know what to try next. If it does it when you let off the throttle- it is the idle circuit. We get a lot of questions about what causes a gas golf cart to backfire and how to solve that problem. with different carb (which came off good running car) has backfire through exhaust when you give it gas took the valve cover off got piston up to TDC both valves closed set distributor to #1 position checked plug wires 3x's or more for correct order. check your fuel screw and make sure it has not fallen out (doesn't sound like it has). My Harley Davidson heritage softail has an annoying backfire from the rear cylinder when I let off the throttle on the freeway or when I'm coming to a light. We bought it off somebody who let the go cart sit for 2 years outside without use. Then hop on the quad and let out the clutch. Most problems that will cause a John Deere lawn mower to stall after 20 minutes occur due to the distribution and rate of flow in the fuel and air systems. Does anyone know why it's backfiring?. It runs fine but whenever I let go of the gas for more than a second it'll start to die. I don’t know what to try next. Changed the filter and it never did it again. With too few calories on board to power you through your daily activities, your body learns to live on less by significantly slowing your metabolism. The engine depends on just the right mixture of fuel, air and spark to. When the exhaust valve opens on that cylinder, the extra air allows the unburned fuel to explosively burn and the popping noise of a backfire is heard. It's not your ECU or crank failier idk why anyone would think it was the crank if it was the crank it wouldn't run after it backfired. In some cases the exhaust also spits out a partial flame. Afterfiring can also be caused by cylinders which are not firing because of faulty spark plugs, defective fuel injector nozzles, or incorrect valve clearance. The question is; If removing the ethanol from the fuel (mixing water with the gas, then shaking the container to have the water absorb the ethanol, then draining off only the gas) then adding a very thin 2 stroke oil to the fuel (maybe 100 to 1), will the oil leave a film on the inside of the gas tank, and rubber gaskets to somewhat protect the. The diverter valve diverts the air going to the exhaust manifold out a vent or to the air cleaner depending on the system and works off of engine vacuum. First, take the gas line off the carb and turn the petcock on to see if gas is flowing to the carb. A backfire results in a temporary loss of power and forward motion along with a loud popping noise. If I give it a LITTLE gas while slowing down, and don't just let off completelyit won't do it. Idle is 1500rpm. I have a Rhino and every time I let off the gas it backfires. It can happen when you start your motorcycle, for example if you stopped the bike with high rpm's and extra gas was left in the carburetor, when you accelerate or let off the throttle. put your hand over the exhaust when its running and you'll here a hiss where the airs getting in. Then, just before he walks off, he pauses for a second or two, taking in the moment. After warm up it acts like it wants to die and sometimes it does but I can always start it right back up by giving it a pump on the gas. Also, there could be water in the gas pump when you fill up your tank at the gas station. I saw these at the expo and was tempted to pick one up. An engine backfire is an explosion produced by an internal combustion engine. Troubleshooting of this problem is pretty simple and you can do it yourself easily. car backfires when letting off gas - posted in Virtual Mechanic: Hi, I noticed that whenever I let off the gas pedal after getting to speed, ie 40mph at 3500rpm, the car sputters and backfire's right around 2500 rmp and as the car sputters, I see that the tach moves rapidly back to 1000 rpm (idle). the engine ran fine on initial start up but original carb leaked gas. and scope tests,we do the fuel pump leak down test on my pump page then do the 2 balance tests. I think it's backfiring but could be wrong. I just got it and it is running great other than the fact that it is backfiring. i just got my warrior about 3 months ago and it was doing something similar it would idle good but then as soon as you gave it any gas it bogged down really bad and you could barely give it enough gas to get it into gear without stalling. , while the engine is running or while shutting down. It doesn't do after I am going faster, only about 10 mph and under. This is a video of a Polaris Outlaw 90 backfiring on deceleration, down a steep hill. Why is fuel inside your engine bad? A leaking gas valve can do more than just waste gasoline. Let's say I'm in 1st or 2nd gear, accelerating normally, and then I floor it, I feel LOTS of hesitation and a pop or 2 (not a backfire) from the exhaust. I revved the engine holding it at about 2/3 throttle and at least it didn't spit and pop through the carb but when I let off the throttle it went down to about 1/4 throttle and the RPMs stayed there until I bumped the throttle then it dropped to a really low idle and then once again it died. I just went to the gas station and got 2 gallons, bought it back in a pink container. Re: Why do my Kohler engines backfire when shut off? When you shut the engine off( especially from a high rpm) you load the exhaust with raw gas fumes. Club Car Backfires April 2, 2013, 08:54 AM What would make an 97 Club Car backfire when the rev limiter kicks in. A backfire is a sign that your car engine is not running optimally and it needs to be checked. Lets use an example: A slip on pipe and an aftermarket filter are put on. my golf cart starts and runs, then after running for sometime that could be up to a hour it will die and not start for several mins, has been as long as 10-20 mins before it will cough a couple times, backfire a couple times and then runs again. Why Does Your ATV Backfire? Backfiring in an ATV engine, or any small engine, is usually the result of either one or multiple spark plugs igniting the fuel in the chamber when it is out of turn, specifically during the combustion cycle when the exhaust valve is open on that cylinder. With too few calories on board to power you through your daily activities, your body learns to live on less by significantly slowing your metabolism. Lean jetting will always cause a backfire when the throttle is closed. Always a very nice light gray, the plugs also. with different carb (which came off good running car) has backfire through exhaust when you give it gas took the valve cover off got piston up to TDC both valves closed set distributor to #1 position checked plug wires 3x's or more for correct order. If your pressure washer shuts off when the trigger is released, it has a problem with the unloader valve. The exhaust is hot and ignites these fumes, thus you get a loud "pop" thru the exhaust. Turn it clockwise until it lightly seats (till it stops) - count. The faster you try to go, the more apparent this symptom will be. Ended up taking it into the shop, and the mechanic about laughed at me and had it fixed in under 10 minutes…. First off, most people on here don't know the difference between a bog and a hesitation. My atv is backfiring when I give it the gas and also cuts out when riding. Backfire issues are corrected by troubleshooting and fixing the fuel-to-air ratio. 5 Reasons Why Your Car Dies While Driving. carb was rebuilt think its not lean. If your ATV doesn't turn over when the ignition is engaged, or only tries lazily to do so, your battery may be low on juice. My O2 sensor is new (from my smog test fiasco about six months ago). But after it warmed up it would hardly do it. Once started, a lawnmower typically keeps running until you power it off. A backfire results in a temporary loss of power and forward motion along with a loud popping noise. After waiting a few seconds, restart your car with your foot still on the gas pedal. Still does it. Clicking this will make more experts see the question and we will remind you when it gets answered. If this keeps happening to you, though, you may want to have someone take a look at your fuel gauge as it could be giving you a false reading. The opening three episodes of Dirty John: The Betty Broderick Story laid out first the high emotions involved in Betty and Dan Broderick’s contentious split, then the origins of their. That kind of popping/backfiring. The other day i injured myself at work, I'm a forklift operator and i slipped off my lift and hit my head on a steel support beam and blacked out. Once the engine warms up it doesn't do it anymore. Has new plug and decent spark. Locate the source of the fuel or air loss to get. You will have to find out why the fuel pump is not pumping. car backfires when letting off gas - posted in Virtual Mechanic: Hi, I noticed that whenever I let off the gas pedal after getting to speed, ie 40mph at 3500rpm, the car sputters and backfire's right around 2500 rmp and as the car sputters, I see that the tach moves rapidly back to 1000 rpm (idle). Ran it a bit more. I notice that when I am accellerating, if I let off the throttle, my exhaust backfires and pops. When your engine starts backfiring, the first thing you should do is check the engine warning light. My guess is a small or series of vacuum. My 450 atv backfires when i let off the gas - 2005 Honda CRF 450 R. i always set it to off when i leave my bike in the back yard incase someone comes by trying to. So bad that when it would backfire through the carb it would kill the engine. Backfiring on deceleration is caused by a lean fuel mixture. The engine's intake system depends on being completely sealed and free from leaks. so it still backfires with valves adjusted? If so you prob have a fuel issue. The popping on decel is caused by a lean fuel mixture being ignited by the spark on the exhaust stroke. No ifs ands or buts, that's what causes it. Not enough oxygen results in unburn fuel (rich mixture) and too little oxygen (lean mixture) causes more pollutants and can actually damage your engine. seems like not getting enough gas. Car backfiring is not alarming as long as it involves only screeching sounds. My Lawnmower Gas Leaks Through the Air Filter If your mower has a fuel shut-off valve, check it for signs of sticking or damage. But if I am giving it a lot of throttle and then completely let off, it will more than likely backfire. Add in a lean stumble through when opening the throttle (no accelerator pump) the engine pre fires and forces a pre detonation back through the crankcase and. By Andrew Pollack on 01/17/2011 at 10:13 AM EST Eighteen months ago I wrote a little article about how to adjust the brakes on a lawn tractor because I couldn't find the information myself when I searched. An engine running rich will sputter on acceleration. I do not understand your explanation of the 180 degree out of position and I am unsure if you understand my inputs of the firing once per revolution off the current flywheel and the different of the older point system where the engine fires once per 2 revolutions. I have tried turning the steering wheel, letting off the brake and so on. We rode for exactly four days and the muffler broke off in the yard without anybody even being on it. Consumer Reports explains why that happens. But my car only has 20,000 miles on it and is in perfect working condition. Let's now make sure that the on/off switch located on the handlebar is in the on position. The reason eight Yamaha golf cart may backfire when slowing down, is the air to fuel mixture needs adjustment. Let’s go into detail about these 2 issues. The VOES seems to be working because the engine slows down when the hose is removed (low vacuum so it switches to the other ignition curve), and it switches at 6psi with my vacuum pump. And when it does backfire the temp light comes on and there's no throttle response until the light comes off which is about 4 to 6 seconds. Once you confirm you have plenty of propane, check the regulator hose and tank for signs of a leak. The timing is off, check the key in the flywheel , and check to make sure the the timing chain has not jumped or slipped a tooth. Still does it. When you let off the gas to shift a rich condition exist in the exhaust and if air is injected now you get the bacfire. Test the gas grill burners. If you have a leaf spring, solid front axle with the shackles mounted in the rear, your shock absorbers should be mounted as far outboard as possible, but with a slight lean to the rear (About 1 to 2 degrees of rearward rake for every 2 inches of lift above stock, compounded geometrically). I replaced a faulty air cut off piston and my backfiring ceased. Any help you folks can give I'll pass on to him. In my work I’ve observed four productive ways to tend to people’s suggestions with respect and care: If you’re too busy to listen now, schedule a different time to review their thoughts. Measure the voltage of the battery with ignition off and with the engine running. No I do not own a 250ex and never did,I just get to work on one about 20hrs a week! I did not mean for a port/polish to be cure all for the popping when you let off the gas. Does anybody else think that his throttle cable needing adjustment is due to it setting off the the EPC that is located in the thumb throttle box? I have had that happen before. How to use backfire in a sentence. It runs fine but whenever I let go of the gas for more than a second it'll start to die. A good mechanic should be able to fix this with adjustments if you have a new carb. Have gotten my trike running pretty good only problem left is when I let off the throttle and the engine RPMS drop I got some minor backfire out the exhaust. So what is a backfire, what causes it, and how can you stop your lawn mower engine from backfiring?. The VOES seems to be working because the engine slows down when the hose is removed (low vacuum so it switches to the other ignition curve), and it switches at 6psi with my vacuum pump. Exhaust Popping on Deceleration: When you decelerate, you reduce the amount of throttle. If a leaking gas valve or carb float needle cause gasoline to fill the engine crankcase and you attempt to run the bike, the fuel is then pumped through the system washing oil from vital areas such as bearings. guess it was sucking air in when he let off the throttle , but you could check for something like. The scenario is that I have to start it closed evertime and then open the carb. Here's why your Snow Thrower may be leaking gas all over your garage. Ended up going through everything I knew how to (air filter, bad gas, etc. It's that other 10%, that no matter what they try with jets, needles or. my guess is that the packing in the silencer is burning out (normal wear) and you could fix this problem by changing the jet one size at a time till the problem goes away or you can repack the silencer. If the furnace made a clicking noise trying to turn on and then makes the BANG noise at the furnace, it’s most likely a delayed ignition. The bike is NOT Backfiring. This causes the backfire explosion to occur in the intake or exhaust, both resulting in the loud sound. Sometimes when I really let down off of the gas it will cut completely off. guys im having problems with my polaris hunk of crap also(500 sportsman h. I can let go of the throttle and it'll settle back to idling. Wont start and backfiring! Help! Jump to Latest I'd start with a new sparkplug. Motor runs but can’t get the pop pop noise to go away. tighten the screw in and it should up the gas flow allowing it to idle. She started fine,and would rev fine, but when I'd open up the throttle in gear it'd pop and backfire. I cant post in the 2 stroke forum yet. To answer the question, "why does my motorcycle backfire?", you need to know the underlying causes of this problem. It only happens maybe 75% of the time and its only on take offs from a dead. 003" bigger. Wait for a couple of minutes and it will start right up. The opening three episodes of Dirty John: The Betty Broderick Story laid out first the high emotions involved in Betty and Dan Broderick’s contentious split, then the origins of their. mule cuts off like its out of gas. It starts right up but after about 10 minutes it just shuts off. Get the ATV rolling as fast as you can, with the clutch all the way in, up to about 10 mph. Most gas carts do not have fuel injection and do not backfire. It will start fine and idle perfect, but as soon as I touch the throttle it'll pop and backfire like crazy at the carb. To make an older car backfire, start the vehicle and bring it to a steady rev as you normally would, then turn the engine off with your foot on the gas pedal. This mixes the stabilizer up with nice fresh gas, reduces the amount of the tank that's exposed, and dilutes whatever bad gas might be still in the tank. My guess is a small or series of vacuum. It began to backfire and sputter when giving it gas and is losing power. I do notice there is a small exhaust leak where the muffler slides onto the pipe, do you think this leak could effect the backfire problem?. I have a 1999 Yamaha Grizzly 600. Took a short ride around the block to the grocery store without a helmet (i know, shut up) and realized just how loud the pops are. You can see the rough road in the pictures. Make sure you have fuel getting to the carburetor. But the bigger question is how does gas get there in the first place, and that's a bit more complicated. This is the main reason why modified Harley engines tend to backfire through the carburetor more frequently than stock engines. plug looks good. I had thought it was the fuel pressure regulator and the O2 sensor but I replaced them both and it will not start regularly unless I give it gas and hold the gas pedal and if I let off it turns off. An engine running rich will sputter on acceleration. My O2 sensor is new (from my smog test fiasco about six months ago). My atv is backfiring when I give it the gas and also cuts out when riding. no the reverse over ride wont cause that too happen i own one of those,all the over ride switch does is allow more throttle in reverse,if needed,what you should be looking for would be the spark plug not gaped right,or something in the fuel if those get the smallest amount of water in the fuel they will back fire and loose power,and the timing could be off in it also,when i first got mine i. But my car only has 20,000 miles on it and is in perfect working condition. You should hear the engine turning and if you give it a little gas, it should. It doesnt backfire on deceleration or anything, just right after it gets turned off Also, the throttle sticks if your idling and you give it some gas, it will usually return to normal after 5 seconds otherwise it just stays the same. A mower th at backfires is irritating, but thankfully backfiring is not a danger to your engine and lawn mower. Make sure you have fuel getting to the carburetor. Fortunately, battery issues are some of the easiest to fix. I have an 89 Polaris Indy Sport 340. I do not understand your explanation of the 180 degree out of position and I am unsure if you understand my inputs of the firing once per revolution off the current flywheel and the different of the older point system where the engine fires once per 2 revolutions. Delayed ignition. In fact, one should expect a well-tuned high performance engine to "pop" and "crackle" when the throttle is closed at high rpm. The gas valve sends gas to the main burner(s), which is lit by the pilot light. :eatdrink021: My Yamaha G16 gas golf cart backfires almost everytime you let off the gas and come to a stop, Ive only owned it a couple months but it is a 1989 or something like that. Falling off happens, crashes eventually occur and even at slow speeds, it still hurts! Much like strapping a seat belt on when driving a car, always wear the appropriate riding gear including a helmet , goggles, gloves and boots. Hold it to the floor and it will backfire just as the rev limiter kicks in,, runs great other than that. If I don't go all the way to the tool box and press the gas to move, it jerks and I smack my tool box. Higher Gas Prices. If you find yourself facing the expensive purchase of a replacement battery, look no further than Sturtevant Auto. Got on it and after letting off the throttle its backfiring and seemed to bog a bit at slow speed. My winter pilots are 45's, so are 50's or bigger in order?. engine gets good spark and now seems like its getting gas but won't start. Its rare for a cdi to just up and quit. Does anybody else think that his throttle cable needing adjustment is due to it setting off the the EPC that is located in the thumb throttle box? I have had that happen before. Don't do that. The company’s stock will indeed drop about 6 percent over the next day. I hope this is helpful. The detailed answer: Ask five gearheads or mechanics their opinion of starting fluid, and you might get five different answers. It's been running great, starts right on the first pull. Maybe you're flooding the engine by hitting the gas pedal when it's off. Is it because my engine is running rich (deliberate)? I thought it was a "mini backfire" from unburned fuel igniting in the hot exhaust but the engine does it ice cold too! It doesn't sound like it is hurting anything. Popping noises from a carburetor indicate. Every time I step on the gas past 1/4 throttle it backfires like crazy and someties kills the engine. We rode for exactly four days and the muffler broke off in the yard without anybody even being on it. i had lots of problem with my old sportsman due to water in there also make sure the magnetic pick up on the outside of the flywheel isnt covered with metal filing from the starter bedix. What Does Black Smoke Mean. My car has been sitting for about 5-6 months, so yesterday I go to start it as I am starting to get it ready for autocrossing. Seems you may have some trash holding the float down and this would allow the fuel to run free. Don't do that. In fact, when we pulled it off and opened it, took all of the jets out and cleaned them anyway, it was clean, but still leaks gas when we run the ATV. A Misfire happens when the air-fuel mixture is not getting ignited correctly and the combustion cycle is disturbed. But the bigger question is how does gas get there in the first place, and that’s a bit more complicated. If your car does this from time to time, you may not need to do anything. Every time i let go of the accelerator, I get a loud backfire. My truck has been having quite a bit of trouble since I bought it back in June. To test the battery, use a multimeter (which can be purchased on the cheap at any auto parts store) to check for an output of 12V. Many modern vehicles have eliminated carburetors in favor of direct fuel injection controlled by a computer. My old tractor style 46" deck, Craftsmen, powered by a 24 Hp, B & S Intek engine's manual never mentioned having to do this. What it is, is incomplete combustion, fuel is left over, and shot into the exhaust pipes. check you linkages for binding. Hi, I have a 150cc twister think gy6 motor. But I got it turned over first shot no problem and let it ilde for 1-2 mins and took off on it. I've changed the fuel filter (twice), new spark plug, checked hoses for debris best I could. Engine will not start. IMO your idle screw under the gas shut off has vibrated out cutting you gas flow off. I never have popping or backfire during idle, cruising speeds or under accelleration. I just got it and it is running great other than the fact that it is backfiring. Most gas carts do not have fuel injection and do not backfire. Empty the gas tank, properly dispose of the old fuel and try a fresh batch of gasoline. Has new plug and decent spark. Before these last two times never more then four. When it does it shoots fire back through the carb. If the noise originates a few feet away from the furnace when the blower turns on, the problem may be expanding air ducts. Now the bike is only 4 years old but I do have 99k on the motor. I am just Curious, I was out riding in my yard today for about an hour or less and My LTR kept backfiring, I dont have many mods so it shouldnt be running lean, I have a YOSHI RS5 slip-on, Cherry bomb and lid off, what would cause it to backfire? it seemed to happen mostly between shifts, and it would usually be one or two pops. When you ride under about 15 it backfires out the airbox side of the carb on only the front carb pretty consistently, and when you downshift at speed (maybe 25+ mpg) and don't hold in the clutch it backfires pretty badly out the exhaust side, again only on the front. carb was rebuilt think its not lean. So thats why I decided to completely rebuild my head. You're pilot jet controls the low speed and off-idle response, and main jet controls the mid-full throttle response. Car backfiring is not alarming as long as it involves only screeching sounds. Backfires in Exhaust. So I just pulled my bike out of the garage the other day and it's been sitting in there for over a year. Starting a car will require more horsepower, so if you recently filled the gas tank three-quarters of the way with fresh gas, top it off with old gas and then try starting the car. If I don't go all the way to the tool box and press the gas to move, it jerks and I smack my tool box. I just didn't know if anyone else has had a similar problem and may have any ideas what could contribute to this?. Backfiring is caused by the ignition of fuel and air in the INTAKE stream causing it to fire through the CARB. The bike is NOT Backfiring. I've heard blower motors like lots of advance at idle, but only around 31-32 total and advance should come in early. I did put a fuel. Is it because my engine is running rich (deliberate)? I thought it was a "mini backfire" from unburned fuel igniting in the hot exhaust but the engine does it ice cold too! It doesn't sound like it is hurting anything. I have replaced the carburetor with a new one. If the tank is full and the guage reads empty then it must be the guage float/sensor in the tank that is remaining in postion and not moving when. Allow the sealer to set up overnight. Many riders usually experience a backfire when they suddenly let off the throttle. I do not understand your explanation of the 180 degree out of position and I am unsure if you understand my inputs of the firing once per revolution off the current flywheel and the different of the older point system where the engine fires once per 2 revolutions. It starts and idles like it is brand new. The regulator is a critical piece and should to be matched to the type of fuel delivery system and the fuel pump that you are using or plan to use. Any ideas? {John, OK 2004 John Deere 500 Buck Auto}. The noise indicates that the vehicle is out of tune and is performing poorly. My 16 HP did it too, but now that I let it idle it doesn't. Make sure the fuse in ATV is good. Battery, Check. It's like if this thing had a distributor, I'd swear it was way too far retarded or 180 off. Take a look for holes. Mostly, your motorcycle's carburetor is the main source of backfiring. If it was poping through the intake I would say that you would be lean (my softail did that before I got the jets right). Most often a backfire is the result of an air leak in the exhaust system. There is nothing you can do to prevent this obviously because it is the gas station’s responsibility. I'm getting good at longboard now, since I'm not exhausting myself pushing or climbing hills. Typically backfiring results from various malfunctions related to the air to fuel ratio. Found this on the HMF website on Deceleration backfire. The registration fee is $20 for two years. backfires when running and let foot off gas. Note: It is normal for many high performance exhaust systems to moderately backfire or pop when the throttle is closed from mid-to-high rpm. Open up the air box and make sure it's not filled with gas or anything else. Now the popping and backfiring is back at mid-throttle. When I stop the car the engine idles very fast so then I have to push the choke in again until I start out again and have to pull it out so it doesnt backfire. Any suggestion for a remedy? 2003 quadsport z400. So I will try here for now. riding around the yard It seemed to be ok. It from one of the techs Deceleration Backfire is caused by fuel burning in the exhaust manifold or header. KawieRiders. If you're low on gas and you want to start it. You should try a compression test and leakdown test to try and locate where this is coming from. If the valve is still open when the mower is fully powered down, it may be letting fuel leak into other parts of the system. About a second after I turn off the bike it backfires. Backfiring is caused by the ignition of fuel and air in the INTAKE stream causing it to fire through the CARB. ATV winches are small but still powerful and potentially very dangerous. Deceleration back-fire, rough idle, and throttle lag can be quickly adjusted by tuning your carburetor. For a moment when you up shift and often when you let off the gas, there is a temorary "over rich" condition with too much gas in the cylinders. It mostly does it going down my hills but it's very annoying. These can be diagnosed by a compression test, or by tracing top-end noise with a sounding rod or stethoscope. I agree that a good tune job will get rid of most ,if not all the popping on about 90% of the quads. Have gotten my trike running pretty good only problem left is when I let off the throttle and the engine RPMS drop I got some minor backfire out the exhaust. Read More ». you didn't state what your plug looks like, but that will be a tell-tell sign of what your engine needs. Featuring forums for Club Car, EZGO and Yamaha Golf cars. What Cause a Car to Backfire: 5 Reasons behind the Problem. Don't know if yours is a '12, but mine does the same thing on long coasts down a grade, especially when you let off after getting to 40 mph or so. there are 2 things. As I stated it just started this morning. Idle is 1500rpm. Try using starting fluid to aid the starting process, spray a little into. It runs fine but whenever I let go of the gas for more than a second it'll start to die. Check the spark plug for sign of wear and tear. Posted by Larry williams on Dec 07, 2012. My dad's Rhino would backfire when you let off the gas. It's not your ECU or crank failier idk why anyone would think it was the crank if it was the crank it wouldn't run after it backfired. Does backfiring hurt my ATV? If backfiring is happening in the exhaust (after the engine) then it will cause damage to the muffler and exhaust system over time. 2000 Suzuki 500 Quadmaster ATV. If the bike, when you let off the throttle, make loud and hard popping/cracking sounds, almost like firecrackers, it is likely to lean on the idle/pilot circuit. A person that works at O'Reilly who works on Honda's has been great help to me trying to get the car running. This is a video of a Polaris Outlaw 90 backfiring on deceleration, down a steep hill. Generally I am very impressed with the machine. Higher Gas Prices. Why does my new scooter die every time I give it gas? Just got my brand new Eagle 50 scooter from Green Earth Scooters, I changed the oil first thing, filled the gas tank, and double checked all my nuts and …. Backfires every time I let off, extremely loud. The diverter valve diverts the air going to the exhaust manifold out a vent or to the air cleaner depending on the system and works off of engine vacuum. I preach it from my online automotive pulpit: Check thine air pressures, check thine tread. Ford F-250: Why is My Truck Hesitating? Hesitation, or a lack of throttle response, is a symptom with many causes. Runs ok and has lots of power. Afterfire's are more common where long exhaust ducting retains greater amounts of unburned fuel due to rich fuel mixtures. Dont know what is wrong. Have gotten my trike running pretty good only problem left is when I let off the throttle and the engine RPMS drop I got some minor backfire out the exhaust. But I never took a really good look at the tires. Took awhile to get it started but it ran. Once started, a lawnmower typically keeps running until you power it off. This popping is often referred to as the bike backfiring. What does that mean? That there is unburned fuel in the exhaust pipe? Also when I try to start my bike and wont start but lets off a loud bang! Scares me and neighbors cause sounds like a gun shot. It mostly does it going down my hills but it's very annoying. Put valve cover and spark plug back on and try it out. The gas valve opens and sends gas to the pilot burner. That's part of why I chose it - the bigger wheels it comes with. What would be causing that to happen? Quote; Share this post. The noise indicates that the vehicle is out of tune and is performing poorly. It didn't matter what gear I was in, anytime I'd get the rpm's up and run at a constant speed, it'd pop. When the ATV is is warmed up, the oil burns off better, and the smoke goes away. My gas is good and I'm running a 185 main jet. Search Fixya Bogging out when give my four wheeler gas I have a 400 honda foreman it will turn over but will not crank when i hold the throttleand then let off of it then pull start it it backfires but then will just turn over any ideas. Still does it. and scope tests,we do the fuel pump leak down test on my pump page then do the 2 balance tests. Clicking this will make more experts see the question and we will remind you when it gets answered. By Andrew Pollack on 01/17/2011 at 10:13 AM EST Eighteen months ago I wrote a little article about how to adjust the brakes on a lawn tractor because I couldn't find the information myself when I searched. You might have to adjust this a few times because when you tighten the nut, it might cause this screw to turn and tighten. I have checked the timing and it is set at 5* with the vacuum lines removed and plugged, it was recently tuned up with all new ignition stuff and the carb is brand new. Why does my new scooter die every time I give it gas? Just got my brand new Eagle 50 scooter from Green Earth Scooters, I changed the oil first thing, filled the gas tank, and double checked all my nuts and …. The way I see it is if you have a little unburned fuel making it to the muffler when you let off the wick some cold air gets sucked in the muffler burning the unburned fuel. Has new plug and decent spark. I put new gas in and that didn't seem to help but it was low grade. I just got it and it is running great other than the fact that it is backfiring. My procedure has been 1. This can be when coasting or even slowing down, and it’s probably because there isn’t enough fuel getting into the engine as it tries to idle. No I do not own a 250ex and never did,I just get to work on one about 20hrs a week! I did not mean for a port/polish to be cure all for the popping when you let off the gas. The pilot light is lit by an electronic spark. I had that problem with my son's ATV. Is backfire bad for your ATV? How big or bad the backfire is, is usually based on how loud the combustion sound is. What Cause a Car to Backfire: 5 Reasons behind the Problem. The plugs look a decent tan color. In rare cases, a backfire pop when accelerating. Posted by Larry williams on Dec 07, 2012. Its rare for a cdi to just up and quit. Measure the voltage of the battery with ignition off and with the engine running. This only happens right after startup (the engine is cold) and only if I wind 1st gear out to about 3,000 or more RPM's and I let off the gas without shifting into second. My 16 HP did it too, but now that I let it idle it doesn't. i just got my warrior about 3 months ago and it was doing something similar it would idle good but then as soon as you gave it any gas it bogged down really bad and you could barely give it enough gas to get it into gear without stalling. If your pressure washer shuts off when the trigger is released, it has a problem with the unloader valve. It started popping/backfiring when I would let off the gas, mostly on a downhill a few months ago. Any ideas? {John, OK 2004 John Deere 500 Buck Auto}. An engine running rich will sputter on acceleration. If you are truly disgusted with the smoke, then you will have to do what most people do. Enrichening The CV Jetting. Turn it clockwise until it lightly seats (till it stops) - count. It only does it after running at half throttle or more and then letting off the throttle. But now it I have to keep trying to crank it to get it to start and it sometimes backfires in the engine area. Does anyone have any idea whats wrong. pops and backfires when letting off gas. It is usually an adjustment issue and relatively easy to remedy. I do not think rewards are a bad thing, but if used improperly and too frequently, I can see how rewards could be damaging. You should try a compression test and leakdown test to try and locate where this is coming from. Also when ever I pull up to a stop light even if it is warm it will die unless I kick the throttle real quick then it stays idling fine. Why does my scooter slowly stop running? by Dale Whelchel (Spotsylvania, VA) I have a 50cc TaoTao scooter; it will start and run fine for a bit, then just starts losing power and shuts off. My new 900 was delivered last week. it was a simple carb adjustment. In a properly running engine, spark-triggered ignition typically occurs a few degrees before the piston reaches top dead center (TDC). Never a good sign. excess fuel gets through the exhaust valves and burns off causing the crackle/pop (no snap though). The golf cart is getting too much. I noticed that there was a tapping noise in the front end when I let off the gas. Now the popping and backfiring is back at mid-throttle. Run it at about half throttle or a little less and pour the seafoam in the air intake a little at a time until you have poured about half the bottle in it. It's not your ECU or crank failier idk why anyone would think it was the crank if it was the crank it wouldn't run after it backfired. This then would be a time to empty the tank completely and make sure there is no trash there as well. The faster you try to go, the more apparent this symptom will be. Jumps, wheelies, skids, donuts, and off-road exploration are just a few of the things you should only do when it’s legal to do so 😉 It’s EASY. I notice that when I am accellerating, if I let off the throttle, my exhaust backfires and pops. This usually goes away once the engine warms-up. I've heard blower motors like lots of advance at idle, but only around 31-32 total and advance should come in early. My bus keeps backfiring out exhaust only when I let off the gas pedal at higher RPMS Like coming off the freeway letting off the gas it lets out a big backfire. Tightening jet the fell out helped. Any help you folks can give I'll pass on to him. Gas leaks can occur through the air filter and indicate a problem with valves inside your engine. Then when I got about a mile and a half away, it went back to behaving completely normal and did not die when I let off the gas. Turn it clockwise until it lightly seats (till it stops) - count. after the muffler, there are no tailpipes. Higher Gas Prices. KawieRiders. Put valve cover and spark plug back on and try it out. A small flat-blade screwdriver, inserted into the pilot screw slot at the bottom of the carb body, "bottoms" the pilot screw (not too tightly; over- torqueing can bugger the screw tip and/or seat/jet). This causes an overrun, that is, the motor's rpm is turning faster than the fuel provided can support, so the motor begins to spool down. First, take the gas line off the carb and turn the petcock on to see if gas is flowing to the carb. No ifs ands or buts, that's what causes it. Engine will not accelerate. neither is very difficult unless you are guessing at the size jet you need. Have gotten my trike running pretty good only problem left is when I let off the throttle and the engine RPMS drop I got some minor backfire out the exhaust. My car is running great as far as stop and go, cruising, WOT, etc. Things were looking up: I replaced the spark plug, cleaned out the exhaust, adjusted the idle / fuel screws, and even replaced the brakes (I can stop now!). I've used it several times this year. Does any one have any idea what would cause this. The backfiring of the motorcycle is a signal that something isn't quite right. Forced one size bigger torch tip cleaner through pilot jet. I'm getting good at longboard now, since I'm not exhausting myself pushing or climbing hills. Dispose of gas. carb was rebuilt think its not lean. It only happens when I decelerate quickly and it sounds like a 12 ga going off! I just had the carb cleaned due to it sitting up for a while but the guy I got it from said it had always backfired, even when it was new. The timing is off, check the key in the flywheel , and check to make sure the the timing chain has not jumped or slipped a tooth. , while the engine is running or while shutting down. i have a used mule and it had very little hours on it but its a 2003 - sat for a long time and i thought i had. Ran it a bit more. Afterfiring can also be caused by cylinders which are not firing because of faulty spark plugs, defective fuel injector nozzles, or incorrect valve clearance. Backfire is a condition described as a loud bang, poof, explosion, etc. Idle is ok, at about 900-1000. It's only a couple years old and barely used. Reassemble everything and do the same to the other cylinder head's reed assembly. My O2 sensor is new (from my smog test fiasco about six months ago). I dont ride a lot. Now the bike is only 4 years old but I do have 99k on the motor. , but there's one small issue (hopefully) that I'm trying to tune out. The blades are bigger than anything I saw at the expo.