Atv Sputters And Backfires

I notice that when I am accellerating, if I let off the throttle, my exhaust backfires and pops. 0 is running kinda rough. I took the jets out next and made sure they were clean. Starts up like an old carburetor ford. Mini ATV Help. If you apply a small amount of choke you might be able to tell if that clears up the sputters. Verified Purchase. Find the right spark plugs for your Yamaha ATV here. I used greased lightning then hit it with the power-washer, everything but the battery and fuse box. Good Luck. OK, here we go Symptoms: truck sputters, shudders, bogs down, followed by popping or firing up through the intake (think backfire, but instead of igniting gas out the exhaust, it pops up through intake). When? Typically first start during wet or humid weather. The valves have a clearance of. Dirty air filters can lead to worn out air filters. If you see black smoke coming from the exhaust, the fuel mixture is too rich. You are trying to do the same thing as with the low circuit. Re: Cub Cadet 2009 LTX 1040 sputters and backfires Sounds like the carb passages are blocked. I can wait it out or floor it and it will stop. Intake manifold air leak: A lean condition due to an intake manifold air leak can cause backfiring. Hi everyone I have a 2000 Yamaha blaster 200 and I just bought it so I don't know much. Took this video to help diagnose some carb issues. · atv backfire, atv backfire through exhaust,honda atv backfires, honda atv backfiring, quad backfiring. I had both new fuel filters changed, new oil filter and major service at 285 hours - only have about 300 hours on it now. It idles fine and the problem doesn't go away when the Reverse Overide button is used. My Kawasaki FS481v starts perfect (half pull) seems just fine when I first start. It is sort of a quiet pop more like a burp than an explosion sound. As it warms up it does better and better but never running like it should. The RZR570 runs a bit on the lean side from the factory and can have some backfiring under decel. Even if it was in gear it would simply sit there and sputter, spit and backfire and not move an inch whether I had the throttle wide open or I was easing the throttle on. One of the surest indicators of a faulty fuel pump is a sputtering engine — typically at high speeds. I sputtered and backfired around the block to the house never getting over 3 mph, never get any rpm up, just bump along and not trying to stall. this thing will die if i let go of the throttle , was running fine but suddently it started backfiring at full throttle while i was going down the road , now it has no power and sounds like its not firing on time or its out of time the carb now has the idle adjustment screw all the way in and still dies. Hope the cam - valves do the trick for you. Why does my atv backfire and sputter when i try to start it? I have a 2000 polaris scrambler and when i go to start it; it just backfires and sputters; every once in a while it will start and run just fine but as soon as you turn it off your back in the same boat as before. Over the last few days I have been having a problem with my 2008 Sportsman 400 H. Backfires through the intake are generally related to problems with ignition timing, and backfires through the exhaust are usually related to. When running it was fine except when hammering on it. Test run afterwards showed the symptoms persist. pioneer looses power up hill, won't shift, sputters wide open downhill It shifts err, OK, on flat groundno back firing up hilldown hill, I got it up to 30 and it started backfiring I'm checking air, mufflerAND I've been told that the fuel pump contains the FUEL FILTER and I cannot buy the filter!. it starts first kick every time and it'll run good for a few seconds. Before cleaning it the filters I cranked it up and rode it around the yard. ive got a new 2010 Ranger 500 EFI with about the same issue since i got it new last month, been back to the dealer 2 times, still not fixed. Downloaded richer map, still was running fine. I also replaced the fuel filter. A backfire can be caused by events such as shutting down the engine too quickly or rising up on the seat and activating. What do you think of "Disney Play" that is launching in 2019? Which is more expensive: film making or. cause it ran great without stalling, for a pretty long while. A backfire is a sign that your car isn't running efficiently and needs to be addressed in short order. I tried the parking lot trick but it only worked for a couple minute then it went back to sputtering. You are trying to do the same thing as with the low circuit. I tried to replace the spark plugs, the ignition coil and even the cdi. If you see black smoke coming from the exhaust, the fuel mixture is too rich. Would the timing cause it to backfire while driving down the street? It sounds kinda like a "Gurgle-sputter-sputter-sputter" kind of noise. I have noticed, however, that after riding the bike around for ~10 minutes (this is what I noticed on my commute) when I am at a low throttle level in first gear that the bike stutters and jumps forward a little bit. Spark comes from the ignition system. Average repair cost is $160 at 109,200 miles. If you see black smoke coming from the exhaust, the fuel mixture is too rich. This difference causes backfire in the exhaust. com is the largest Kawasaki ATV owner's forum with information for the Kawasaki KFX700, Brute Force, Prairie, Bayou, Mojave. Then it starts spitting and sputtering when I gas on it. When the coil got hot it would spit and sputter and backfire. If it runs too rich you risk valve damage and backfiring. We shut the engine off, but left the key on so the fan would run. Texas Offroad Network Forums » Forums » Maintenance and Hot Mods » Dirtbike Maintenance - Advice, Addons, Mods, and Smart Tips » yz 450 rough idle and backfire on decel Register User Portal Page Forum List Calendar Active Topics Search Who's Online FAQ. I had a total power loss from 70 to 55 mph while i was WOT (wide open throttle). CarComplaints. It's beat up pretty bad. It idles fine and the problem doesn't go away when the Reverse Overide button is used. After 15-20 min it. it could be something wrong with the carb. defective spark plug wiring). A rhythmic popping sound which is not as prominent as lean under power backfires. The problem is always at about 1/4 throttle, it spits sputters and backfires until I get rpms higher then runs fine whether. Then it wont start until it has sat for a while. Now, I did a little bit of research and found DME relay to be a common issue, so I ordered one. Here is a little background on what has been going on with it. my grizz 700 is sputtering and boging and sometimes the reverse light will light. The thrill of riding your motorcycle is lessened somewhat if your motorcycle tends to backfire. Before I took it in, the battery light would flash periodically. here's a short clip i took today. The valves have a clearance of. Most of the time my 2001. now after the reapair i have put on 200 miles without. 2003 Rubicon backfires then stalls engine? Last few times I been riding, occasionally my atv backfires (Not loud, but softly) and causes the engine to die? Although the atv quits, I can immediately restart the bike and it seems to run fine. Test run afterwards showed the symptoms persist. Click on a term to search our sites for related topics. You may have to turn the idle out another ¼ turn to smooth out engine operation. It is often said that for an engine to run you need fuel, air, and spark. MISFIRE and TROUBLESHOOTING the ENGINE - CF-106. Setting Timing Marks on 2001-2011 Arctic Cat 250-700 ATV INSTANTLY DOWNLOAD Arctic Cat ATV repair manuals straight to your computer in seconds. Backfiring, is extremely rare these days with electronic ignitions and the high reliability of engines. Test run afterwards showed the symptoms persist. just before I called it a night I pulled the boot off of the spark plug and it is very rusted inside, to the extent there was a spring inside that disintegrated in my ha. Spark comes from the ignition system. What do you think of “Disney Play” that is launching in 2019? Which is more expensive: film making or. Hi everyone I have a 2000 Yamaha blaster 200 and I just bought it so I don't know much. 3 Basic Causes of Stumble. When I look at the gas filter it is not full of gas. 15 km/hr with non-stop sputtering and backfiring. I finally got it started after changing the plugs. I can give it gas and it sounds good. 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. After that and a spray down with carb cleaner and compressed air, new carb kit and an inline fuel filter installed, my 97 started like a champ. Could the sputtering be due to not enough gas? Or does the carb. Dirt Bike ATV A Simple Guide To Jetting Your Carb. finally checked forums and found the throttle position sensor is out of adjustment. You are trying to do the same thing as with the low circuit. Diaphram is in great shape. When running it was fine except when hammering on it. Backfire and sputtering under throttle - posted in MXZ / Legend / Summit / Grand Touring / Formula : Ok Gurus, I need your help. Really amazing. John Schultz Portage, WI. Whenever it lost contact or arced it would spit and sputter and backfire through the carb. Sputtering with backfire? KawieRiders. And so your ATV thinks the emergency break is on. What causes an ATV to backfire and jerk when you try to ride it? Answer. Normally a slight backfire or popping in the exhaust indicates a lean condition. I figured since it's a engine temp related problem that a new temp sensor might solve this problem. now after the reapair i have put on 200 miles without. Something i noticed is that i can rev it above 4k rpms in park w/o it sputtering, but when i drive it whenever i accelerate it sputters. No more miss, sputter, or backfire. Rebuilt crank, new pistons, gaskets, seals, etc. helps me out ppl wat does it need. it will idle. Page 1 of 1. If you haven't made any mods to the exhaust then the backfiring can be a problem with the ignition system (ex. Showing 1-26 of 26 messages. Timing light shows it's fine while idling, but when depressing thumb throttle, at a certain point it will start missing, cutting out, backfiring. Or Sign Up with Email. Then hop on the quad and let out the clutch. 2003 Rubicon backfires then stalls engine? Last few times I been riding, occasionally my atv backfires (Not loud, but softly) and causes the engine to die? Although the atv quits, I can immediately restart the bike and it seems to run fine. Went out and finally managed to get my exhaust fitted to my downpipes using a gasket I made from a can of Macaroni Cheese Anyway, tried to start my bike after it and it wouldn't start, it was turning over but just wouldn't fire up, then it sounded like it was backfiring Battery got drained so I just fully charged it and same is happening - turning over but not firing up!. Even if it was in gear it would simply sit there and sputter, spit and backfire and not move an inch whether I had the throttle wide open or I was easing the throttle on. If I just have it in transport mode or just sitting there it starts to sputter/backfiring. grizz 700 sputtering or boggin out and the reverse light coming on - Yamaha Grizzly Forum : GrizzlyOwners. The problem is always at about 1/4 throttle, it spits sputters and backfires until I get rpms higher then runs fine whether. Anyone have any ideas as to why my Kawasaki 360 sputters and backfires when I try to accelerate?. Cam design: Long duration cams with early opening intake valves can contribute to backfiring. Some people call this "dieseling" or "run-on". And so your ATV thinks the emergency break is on. or the jetting is off. Was running just fine through the farm, all at once lost all power and began backfiring through the carb. Hope this helps. So no smoke but backfiring. Compression still reads. A few days after recieving it back, I took it for a bit of a ride. More than likely your engine is "popping" not really backfiring. This has been going on for some time now. My first sled was a 1978 Enticer 250. Jets were clean so I reassembled the carb. It turned out to be a plugged fuel filter. Backfiring, is extremely rare these days with electronic ignitions and the high reliability of engines. General Scooter Board. i have a 110cc atv that when i throttle it less than 1/4 of the throttle it sputters an if i throttle it more it will backfire i cleand the carb n check the spark plug so. it STILL does the same damed thing. And that's why your getting a nice idle but backfiring and sputtering when you try to accelerate. January 21, 2014. Thanks for the offer Terry much appreciated buddy rode it today all day with same problem sputtering and popping at low Rpm but runs well at wot but stalled a lot today guess he has a dealer in Edmonton he called and is takin too on Tuesday picked up a set of plugs late tonight from vinny at NAPA whiskey lid fell off tonite and he drowned his sorrows will change in morning ya we need a 12. A backfire can be caused by events such as shutting down the engine too quickly or rising up on the seat and activating. I took the carb out and cleaned it best I could, the jets seem to be clear. Click on a term to search our sites for related topics. Why is the engine bogging under acceleration? I recently managed to get the moped running properly, albeit for only a short time. It was in the shop for the 60K service and I had it diagnosed. I have a 1999 Yamaha Grizzly 600. Going up some of those mountains on the blueridge, the Jeep would start sputtering and even backfiring when under a lot of load. if you just crank it it will idle as pretty as you ever seen, but when you give it gas it just sputters and spits back. In other words, ATV backfiring occurs due to a short, sudden instance when the engine is too lean or. It wasn’t drivable, so I took a friends car to work. Changed the filter and it never did it again. This is a very common problem with cars today and the fix can be very easy and often times performed at home. 2003 Rubicon backfires then stalls engine? Last few times I been riding, occasionally my atv backfires (Not loud, but softly) and causes the engine to die? Although the atv quits, I can immediately restart the bike and it seems to run fine. ASK ALL GENERAL QUESTIONS OR BASIC QUESTIONS IN THE POLARIS FORUM. New Member Introductions. I have a 1997 Polaris Xplorer 500 that idles just fine, but will start popping and die if I give it any throttle. Backfires through the intake are generally related to problems with ignition timing, and backfires through the exhaust are usually related to. Is the fuel injector bad or clogged and. i need some help. the scooter still backfires during deceleration. I finally got it started after changing the plugs. Then it runs for about 10-20 seconds and starts to surge-backoff-surge-backoff, all the while losing power until it just dies. An engine needs a few thousand volts of potential for the spark to jump the gap between the center and side electrode at the tip of a spark plug. Was running just fine through the farm, all at once lost all power and began backfiring through the carb. The problem is when you really get on it and start going through the gears it'll sputter and backfire at high rpms. I used greased lightning then hit it with the power-washer, everything but the battery and fuse box. When I first start it, it spits and sputters and sometimes backfires. A carburetor is a device that controls both the amount of air and fuel that is allowed into the cylinders. Also if the cable is adjusted to tight you can also end up with a check engine. First I have a 2011 can am outlander 800. -Standard Dobeck map +10%. It runs good until it is warmed up, then it sputters. Which was also fixed. If I just have it in transport mode or just sitting there it starts to sputter/backfiring. My air compressor is a great tool, but its ability to shoot out seats, springs, and jets is unprecedented. Guys I have a 07 700 raptor, just here lately when I first start it up its runs flawless but about 2 min's after it has been started it starts popping/missing Barley running, Sort of acts like it's running out of gas, but it will sit and idle all day, as long as you don't touch the gas, It has just started doing this I rode it all day everyday parked it one night started it back up and BAM. My brand new (20 miles) Outty 850 xt-p was running well, but today I went for a ride and about mile 4 the engine started sputtering a bit and occasionally backfiring, lower rpms seemed worse. Real backfiring means the engine is not properly timed and the fuel/air mix is getting a spark and ignition at the wrong time (when the intake valve is open). It was the carb that is pre adjusted/jetted and was supposed to come. Completely random backfire through throttle body. It does fine driving around, but when you let off the gas, and just sitting at idle, it runs kinda rough, and eventually dies. thought it was a good deal. It came yesterday. ASK ALL GENERAL QUESTIONS OR BASIC QUESTIONS IN THE POLARIS FORUM. If that all checks out it's probably a gas problem. What should you check first if an ATV backfires and will not start? Unanswered Questions. I turned up the idle screw a bit and it stopped backfiring, unless you tried to choke it, then it would backfire. When you crank it with go dead a few times, when riving the engine up and when it goes under 2000rpm motor with die then as well. A lot can be learned by listening to your engine, so if your car starts to change its tune, you should take heed. After letting it cool tried it again, the sputter was back!. if you just crank it it will idle as pretty as you ever seen, but when you give it gas it just sputters and spits back. sputtering and backfireing; raptor 660 backfire sputter. 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. Have you the ability to see about any engine codes? Sorry to ask what may seem obvious, but your post doesn't say much other than it sputters and changing o-rings did not work. Polaris makes a range of outdoor engine equipped vehicles such as quads, snowmobiles and amphibious all-terrain rigs. TIP: Always keep an owner's manual, a small flashlight and a set of basic tools with your ATV when out on the trails. Real backfiring means the engine is not properly timed and the fuel/air mix is getting a spark and ignition at the wrong time (when the intake valve is open). If your Sportsman 500 is giving your problems with starting, there are three areas to. I started it back up and it crank real hard for 10-15 seconds. I have a '03 Yamaha Kodiak atv that starts when its cold, runs for about 1 minute then gets rough backfires and dies. Damaging Effects of a Worn Out Air Filter. I have a 99 sportsman 335 that pops,backfires,sputters and runs like crap if you give it more than 1/3 throttle. Anyone have any ideas as to why my Kawasaki 360 sputters and backfires when I try to accelerate?. TIP: Always keep an owner's manual, a small flashlight and a set of basic tools with your ATV when out on the trails. This service repair manual covers the 2003 Arctic Cat 250 300 400 500 ATV 4x4 Utility 500 4X4 REPAIR. Re: Cub Cadet 2009 LTX 1040 sputters and backfires Sounds like the carb passages are blocked. [Archive] Anything Air/Fuel related. Really amazing. This may also take the form of a sputter. When riding around the yard, it spits and sputters during operation with the throttle pushed in. The bikes starts up with no problem. On my way home from work yesterday, I was getting on the highway again, and it sputters and stalled, rolling down the highway I jump started it, and BOOM! huge backfire. My air compressor is a great tool, but its ability to shoot out seats, springs, and jets is unprecedented. I really need some help on this. This service repair manual covers the 2003 Arctic Cat 250 300 400 500 ATV 4x4 Utility 500 4X4 REPAIR. Heres my problem, ok first thing is when we bought it, it wouldn't start at all. Dealer played around for an hour $70 and changed some settings and I got the 'come get it calll'. Afterfire occurs after the engine has been shut off. Most of this occurs during acceleration. An engine running lean will backfire on deceleration. In other words, ATV backfiring occurs due to a short, sudden instance when the engine is too lean or. It is meant to have the comfort of a side-by-side and the handling of an open-seat ATV. I took carb off and completley disassembled and cleaned all jets with solvent and compressed air,nothing is plug up or blocked. Here is a little background on what has been going on with it. Here's a common issue with the Polaris ATV. To do this you need to remove your needle valve, and re-locate the E-Clip. But I got it turned over first shot no problem and let it ilde for 1-2 mins and took off on it. Then hop on the quad and let out the clutch. fast 125cc atvs mule atv pops and sputters while running, atv sputters under load, The noise changes with engine RPM and stutters slightly before the I have a 2005 Ford F-150 that Hesitates (jerks) and sputters upon acceleration sporadically. I really need some help on this. my ranger will idle but backfires and dies when given gas - Polaris Polaris ATV question. The backfiring of the motorcycle is a signal that something isn't quite right. Float level is within specs. Is the fuel injector bad or clogged and. A backfire is a loud boom or bang that occurs when the engine slows rapidly. I try again, but this time it doesn't even sputter, it won't fire at all. I got about 400 yards and it started backfiring and starting to sputter it did this untill it stalled. Hi everyone I have a 2000 Yamaha blaster 200 and I just bought it so I don't know much. It is sort of a quiet pop more like a burp than an explosion sound. 7) Carter Only. A backfire is a separate phenomenon from an Afterfire. Why does my engine still try to run after I shut it off? This is a common problem that can be caused by a couple of things. My dad's Rhino would backfire when you let off the gas. More than likely your engine is "popping" not really backfiring. essentially hydro locking. Once again, turn screw all the way in (clockwise) and then out (counter-clockwise) 360 degrees (1 full turn). I started it back up and it crank real hard for 10-15 seconds. Arctic Cat forum is a community to discuss Arctic Cat 400, 440, 500, 650, snowmobiles, sleds, ATV's and more. An afterfire is a type of backfire - not all backfires are afterfires, but all afterfires come in the category of backfire. A backfire results in a temporary loss of power and forward motion along with a loud popping noise. 7) Carter Only. A rhythmic popping sound which is not as prominent as lean under power backfires. BIG BEAR 4X4 Offroad Vehicle pdf manual download. So here's my issue. But you also need compression and the correct spark timing. Backfire and sputtering under throttle - posted in MXZ / Legend / Summit / Grand Touring / Formula : Ok Gurus, I need your help. It would kick over and backfire every kick or so. 3 Basic Causes of Stumble. As it warms up it does better and better but never running like it should. The Ohio Steel all-purpose Flatbed ATV cart is The Ohio Steel all-purpose Flatbed ATV cart is ideal for hauling heavy bulky items. It was the carb that is pre adjusted/jetted and was supposed to come. This was a bike I used to ride on a regular basis, but parked it and haven't touched in awhile. My dad's Rhino would backfire when you let off the gas. Something i noticed is that i can rev it above 4k rpms in park w/o it sputtering, but when i drive it whenever i accelerate it sputters. Have you the ability to see about any engine codes? Sorry to ask what may seem obvious, but your post doesn't say much other than it sputters and changing o-rings did not work. Find the right spark plugs for your Yamaha ATV here. took it to the dealer 2 times. com ATV Enthusiast Community forums, you must first register. Browse the threads and you'll likely find some great tips that'll help you out. Diaphram is in great shape. Slides seem to be clean and. Still would not idle very good but ran pretty good. Any help is appreciated! Rhino 660 diff won't disengage - Yamaha Rhino Forum - Rhino Forums. helps me out ppl wat does it need. A backfire is a sign that your car isn't running efficiently and needs to be addressed in short order. I have lately noticed my bike being jerky sometimes, I'll watch my RPM's and they will drop for a split second and go right back and it goes like that for a while and eventually it stops. I had the same problem on my Kohler Command 16 on my simplicity. cause it ran great without stalling, for a pretty long while. You should hear the engine turning and if you give it a little gas, it should fire. Damaging Effects of a Worn Out Air Filter. The CV type, Constant Velocity or Constant Vacuum, uses pressure to raise the throttle slide where a cable is used in the slide model. While it's not dangerous, it can be a symptom of other problems, and should be addressed. This morning I go out to try & start it, it cranks & cranks, sputtered a couple times, but won't fire up. Then it wont start until it has sat for a while. The problem list below will give you an idea of what causes could be generating this condition. Started going to the road to the camp and she stared to stall out like it was flooded or not enough fuel and then she back fired. I have a 1999 Yamaha Grizzly 600. I have a chinese atv with a 110cc engine, I just replced the gear set in the tranny cause fourth gear lost some teeth, it is a 4 speed. Now here is where problems can arise. An engine backfire is an explosion produced by an internal combustion engine. After letting it cool tried it again, the sputter was back!. The causes of most engine backfires fall into two categories: gases explosively expelled through the intake manifold, or explosions that take place within the exhaust system. Cleaned the air filter, went riding on Monday. A backfire can be caused by events such as shutting down the engine too quickly or rising up on the seat and activating. Page 1 of 1. i have a 110cc atv that when i throttle it less than 1/4 of the throttle it sputters an if i throttle it more it will backfire i cleand the carb n check the spark plug so. We have NGK spark plugs for wide range of models and years. A weakened fuel pump can cause the vehicle to take more cranks to start than normal, and in more serious cases may even cause the vehicle to require multiple turns of the key before it will start. Or you turn on your lights and the engine stops as well when your fan comes on and it does the same. If you didn't find what you were looking for here, feel free to check out our archives of old scooter running/stopping questions. i need some help. Sizemore 158 Comments Polaris is recalling 95,000 ATVs due to defective electronic control modules (ECMs) that may overheat, causing a fire and burn hazard to riders. Please enter your desired user name, your email address and other required details in the form below. We replaced the plug, bent the reed values shut, checked the fly wheel (to. last week I took my 2001 SR5-TRD to the wash-rack to degrease the engine bay. The factory Evolution engine's ignition can contribute backfiring through the carburetor. Guys I have a 07 700 raptor, just here lately when I first start it up its runs flawless but about 2 min's after it has been started it starts popping/missing Barley running, Sort of acts like it's running out of gas, but it will sit and idle all day, as long as you don't touch the gas, It has just started doing this I rode it all day everyday parked it one night started it back up and BAM. We shut the engine off, but left the key on so the fan would run. · atv backfire, atv backfire through exhaust,honda atv backfires, honda atv backfiring, quad backfiring. I left gas in it throughout the winter and went to. Re: backfires through throttle body 03-15-05 11:46 PM - Post# 649371 In response to CDAUSA I would change the fuel filter, yes, again. Funny thing is it idles fine just like its supposed to, but when you push the throttle, it starts backfiring and sounds like it chokes to death and will kill the engine if you dont let off quickly. I've gapped and replaced the spark plug. -Our stage 2 map for a free flowing intake and exhaust. I have a 2006 660. Thanks for the offer Terry much appreciated buddy rode it today all day with same problem sputtering and popping at low Rpm but runs well at wot but stalled a lot today guess he has a dealer in Edmonton he called and is takin too on Tuesday picked up a set of plugs late tonight from vinny at NAPA whiskey lid fell off tonite and he drowned his sorrows will change in morning ya we need a 12. took it to the dealer 2 times. Float level is within specs. As soon as the fan cut off, I restarted and it did fine for about 1 mile then went thru the same progressive sputter, backfire and then down to a sputtering idle - then fan cooling and go again. Once the car stays cranked and warms up it doesn't do it anymore. Fuel delivery is totally interrupted during engine overrun, preventing any possibility of sputter and backfire altogether regardless of how lean or rich they happen to be tuned or even if vacuum leaks are present for that matter. Engine power loss and sputtering 48 Answers. Re: 22hp Briggs Intek V Twin backfiring and sputtering at WOT Man, I feel silly, I "lost" the main jets and did not put them back in when I reassembled the carb. This machine starts, idles, and putts around out on the trails for the most part just perfect. Cleaned the air filter, went riding on Monday. If you haven't made any mods to the exhaust then the backfiring can be a problem with the ignition system (ex. We are an enthusiast site dedicated to the Yamaha Raptor ATV/Quad. Almost all backfire situations will have other symptoms attached to them such as a Check Engine Light illuminated. This started happening after my daughter ran it out of gas. Step 1 - Once a check engine or service engine soon light has determined a lean engine code has materialized, a repair procedure inspection is needed. well ground- And things can get really screwed up.