Atv Backfiring Through Carb

After looking around I discovered that the carb had blown out of the intake. This carburetor likely also fits other models and brands from China. She idles like a new bike now, but I have to pull the choke about half way out to get it to rev up without backfiring back thru the carb. · atv backfire, atv backfire through exhaust,honda atv backfires, honda atv backfiring, quad backfiring. If the engine responds quickly with a gratifying blast and no backfiring through the carburetor, you have your idle mixture right. Problem: Engine is backfiring through the carburetor. Discussion in 'Lawn Mowing' started by MOTES, Clean the Carb (I'm sure i clean eveything in the. Login with Facebook. The carb has been running rich it seemed lately as there is a lot of carbon coming out of the tail pipe. Is it backfiring through the exhaust or carburetor? Does it run better with the choke on? If so then I would look into the carb issues paw mentions: clogged pilot jet, torn o-ring etc. hope this helps. it now does it with the Howell TBI kit i just installed today. 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!. The 91 XR250R came with a #40 stock pilot jet and #125 main jet, Last year I tear my carb apart to clean it and found the previous owner had it jetted at a #45 Pilot and #145 Main. This generates an increased vacuum signal which can draw more fuel through the applicable fuel circuits. Went to camp to ride and bike started running like it was running bad. Automobile experts believed that backfiring is most likely to happen to older car models any time with several hundred thousands of mileage. It was very inexpensive so I placed the order along with carb and air filter combo. I'm not 100% on those numbers, more like 98%. The backfiring through the carburetor (the coughing or spitting), on the other hand, frequently happens in the morning when the carb’s air/fuel mixture is too thin. 3) Replace the power valve. Drain your float bowl first, it sounds like you have some old fuel in there that has gelled up, and change your fuel if you haven't already. Backfires and loud explosion-like sounds are common when an antilag system is present and active. Buy Kawasaki Prairie 650 & 700 / Brute Force 650 Carb/Carburetor Rebuild Kit: Carburetors & Parts - Amazon. Just wondering if this is normal/safe?. -Our no more backfire map to eliminate the lean backfire on your stock unit. Carb is a Mikuni 38mm BSR Running at idle the engine backfires through the carb (into the airbox). You know how if it's advanced too far it starts real hard and rough but will rev to the moon, but if it's retarded too much, it starts super fine but sputters and bucks and spits and kicks. DO NOT SEND PARTS TO MANUFACTURER WITHOUT CALLING FOR TUNING CONSULTATION AND WARRANTY CONFIRMATION OR. When I do run it to try to warm it up it will backfire and ride rough. This same engines is used in other ATVs and dune buggies. 400ex backfire through carb help. If the engine is flat or will not accelerate, decrease the main jet by. when idling the engine down, or after the engine has been shut off. Huansong part number: 16100-F12-0000. I recommend always using a premium high octane fuel for your bikes. Too much fuel is delivered, resulting in unburned fuel in the exhaust. This only happens at cranking speeds. Carb is clean. On the engine you have now to rotate the fiywheel 180 degrees will do nothing but put it back where it is firing now IMO. I have already replace the head, flywheel key, cleaned out the carb and bypassed the fuel filter. Went thru the carburetor, correctly set the float, rebuilt the carb with a full kit. It will pick up speed with the throttle, but not very well. A Yamaha Bruin 350 repair manual is a non-OEM manual that's designed by a team of expert all-terrine-vehicle Yamaha Bruin 350 technicians. Chances are that if you have a stock ATV, you're in the same boat. 5 hp Briggs & Stratton riding mower, it lost almost power and backfires fiercely through the carb at any rev above an idle. Excessive blow back can be causes by valves being out of time with crank which will also cause rough running Roug running can be caaused by out of time spark, check the flywheel key. The carburetor itself could be producing a lean mix, causing backfire during normal operation as well as during deceleration. 07 Grizzly 700 Popping and Backfiring New problem with the 700. So I now know its running a little rich, amd more adjustment was needed. can-am ATV Forums - can-amtalk. I recommend always using a premium high octane fuel for your bikes. 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. Van Noy warns against low-profile hats, especially those that ask the air to turn. If the engine responds quickly with a gratifying blast and no backfiring through the carburetor, you have your idle mixture right. It also does it sometimes when I let off the throttle. I would lean more to a fuel condition. water in gas or out of time change the spark plug and check the carb bowl for water if there is then drain the tank and clean the carb Additional comment: Often when you have a motorcycle or ATV. Also is branded in North America under Baja which is sold by Canadian Tire in Canada. Valve train trouble should do it at WOT as well. I took carb off and cleaned it even though I just cleaned/rebuilt it a couple weeks ago. But, it would not rev cleanly, and was backfiring through the exhaust. On bikes these arent very noticable though, and if you've worked around carbureted cars advance the ignition timing to far and you'll see what i mean about a backfire. I have already replace the head, flywheel key, cleaned out the carb and bypassed the fuel filter. It was very inexpensive so I placed the order along with carb and air filter combo. Inside a carburetor is a venturi, fig 1. I checked fuel flow from the pump before putting the line back on and filled up a 16oz bottle in a few seconds. I asked about the way the gas was being ejected to determine if it was a backfire versus stuck float. · Popping/backfiring through carbI have had the new air filter and exhaust tip for a while now and it ran fine until recently. i have good spark, great compression, mixture screws are set. 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). Why does my engine spit or backfire? First off, you need to determine whether it is backfiring out the exhaust or back up through the carb. Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum > Honda Model-Specific: General, Technical, and Performance ATV Forums > Foreman 450 > Lean, backfire through carb, bad idle, 03 foreman S. and a good cleaning of that wouldnt hurt anyway, or you arnt running high enough octane gas in it. Valve train trouble should do it at WOT as well. 1993 - 1995 KODIAK YFM 400. when ever the quad revs up high and comes back down it back fires harshly. Went thru the carburetor, correctly set the float, rebuilt the carb with a full kit. put your hand over the exhaust when its running and you'll here a hiss where the airs getting in. It ran better, but still wasn’t good enough. The heat from the pipes then ignites the vapor and boom, backfire. all the wires are in the right spot. Carburetor Troubleshooting Guide. I bought a 360 prairie that was having a problem with a backfire through the carb. 2001 Polaris Sportsman 400 atv with backfiring out of the carb at high rpms. It starts really easily but does not get to full speed (there is no idle setting). It was the carb that is pre adjusted/jetted and was supposed to come with new air filter (never got one) I also drilled holes in my exhaust. This carburetor is for the, made in China, Jianshe 250cc ATV. A backfire is a separate phenomenon from an Afterfire. how do i check to see if the vaccum advance is working properly? i want to check all the possiblitys it could be before i go and tear down the carb and rebuild it. Also not familiar with that particular carb, but instinct tells me you're right about it being the low speed jet. Buy OEM Parts for Kawasaki ATV 2007 Carburetor(A7F) Diagram. Power now very low and backfiring through carb. 1993 1994 1995 Yamaha Kodiak 400 Carburetor YFM 400 4x4 Carb ATV YFM400 u. For this soak the jets and carb in carb cleaner, then take a very small wire and run it through each orifice of the jets, then use compressed air to blow them clean until you are satisfied they are clean enough. Here's a chart that can give you some clues of Rich vs. Does it do this anytime or only when you try to blast from idle? If you want to sort out the inner motor from carb working, a compression or leak-down test will tell you if the intake valve is open. Note: Backfire and afterfire through the carburetor will not harm the engine at all! Find out the most common causes and possible fixes for engine backfire and afterfire. When I got it home I drained the old gas that was still in it and poured some seafoam and gas back in it. Poor or unregulated engine timing is often a cause of intake backfires, but can also be responsible for exhaust backfires. You could just run some carb cleaner through the carb first before taking the carb out and doing a good cleaning. After looking around I discovered that the carb had blown out of the intake. 05-06-2013, 09:49 AM #8. If backfiring occurs through the carburetor then adjust the idle mixture screw out another 1/8 to 1/4 turn. Wiki User 10/31/2010. The valves have a clearance of. If i need to jet it what size should i start with? warrior carb. Then re-assemble the carb and try the quad again. the tech said the needle might need to be adjusted tried changing that both up and down but it ran worse either way if i go slow and steady on throttle there is no issue any ideas? second issue is i noticed a backfire through carb when starting a few times is the timing off?. Any ideas?. - Answered by a verified Motorcycle Mechanic. Click on a term to search our sites for related topics. Carb is a Mikuni 38mm BSR Running at idle the engine backfires through the carb (into the airbox). The carburetor itself could be producing a lean mix, causing backfire during normal operation as well as during deceleration. Re: 62 6 cylinder backfiring through carb 01-20-06 05:28 AM - Post# 850513 In response to jtyree The subframe is the same 6 vs. 3 to a 350 in my 89 c1500 pickup, when i went to start it up last night it backfired out the carb. Why does my atv backfire? i have a 1997 honda recon 250cc. i'm at my wits end trying to figure this issue out. Is it backfiring through the exhaust or carburetor? Does it run better with the choke on? If so then I would look into the carb issues paw mentions: clogged pilot jet, torn o-ring etc. 15 Free YouTube subscribers for your channel. Tips to Prevent Backfire. This carburetor is for the, made in China, Jianshe 250cc ATV. 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!. I've cleaned the carb and even tried a different carb to no avail. 400ex backfire through carb help. surfnturf. moving it several turns seemed to have no effect on idle smoothness. December 8, 2016 and we sometimes get a commission through purchases made through our links. The carburetor regulates the flow of fuel and air to an engine. And worse, many claims of lean conditions and rich conditions are contradictory. If you haven't checked the EGR valve in the last two or three years, do so now. Any ideas?. 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. This condition is generally caused by the incorrect fitting of after-market accessories such as exhaust systems, air filter systems, or replacement carburetors of a different type or size. This is my mates yamaha quad backfiring. Completely random backfire through throttle body. Backfiring that results from damaged wiring disrupts the ignition's timing, which causes a build-up of air and fuel in the engine. It's another factor to consider if you replace your carb. ( Note: "Afterfire" and/or "Backfire" will not harm the engine at all!). i,m working on a gator that is spitting fuel out the carb. It wasn’t clear to me from the original description. This carburetor is for the, made in China, Jianshe 250cc ATV. 4) No power or heat source to choke. Honda service manuals for download I own a motorcycle shop. -Standard Dobeck map +10%. · atv backfire, atv backfire through exhaust,honda atv backfires, honda atv backfiring, quad backfiring. 3 thunderbolt ign 4bbl can get to about 40 mph starts backfiring thru carb till i back it down to 20 or less. carb back in on Friday and it started right up. Terms often used are: Stuttering Hesitating Running Rough etc etc. or you need to adjust the valves, i dont think that would have anything to do with back fireing but maybe with it slowing down, stage three of the clutch may be gone, which then you would need to get a stage 3 hot cam or a new. Re: Backfire through carb when accelerating I think the key to look at is it does it at acceleration, both hard and light, and more after it idles for a bit. Backfiring on an ATV engine is due to an emission system malfunction, in which there is …. Either way a leaky fuel bowl on your carburetor, probably isn't going to end well. Team, Please explain the "spit" in more detail. Many modern vehicles have eliminated carburetors in favor of direct fuel injection controlled by a computer. smoke · First thing to do would be run a tank or two of seafoam through it. Ok, so I've had this taotao for 6 months or longer now, all I've done is install a new carb with larger jet (95) from scrappy dog. If the engine is flat or will not accelerate, decrease the main jet by. 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. Problem CONDITION POSSIBLE CAUSE CORRECTION 3) Ford& Holley Only. It doesn't seem to do it until the engine has warmed up to running temp. Either way a leaky fuel bowl on your carburetor, probably isn’t going to end well. I try again, but this time it doesn't even sputter, it won't fire at all. Outdoor Gasoline and Electric Powered Equipment and Small Engines - Honda GC190 backfiring through carburator won't start - I've got a Northern Tool (NorthernStar) 2700psi pressure washer with a Honda. I just had the valves adjusted, is this the problem. If your dirt bike tends to slough when you punch it and/or backfires when you open it up a bit, you're probably injecting too much fuel. backfiring through carbs. If backfiring occurs through the carburetor then adjust the idle mixture screw out another 1/8 to 1/4 turn. The quad will now idle fine, and no more backfiring through the carb. Why does my engine backfire through the carburetor? "Backfiring" is a condition described as a loud bang, poof, explosion, etc. Power valve blown out by spitback up through carb. Excessive blow back can be causes by valves being out of time with crank which will also cause rough running Roug running can be caaused by out of time spark, check the flywheel key. Although there are many problems that can cause the intake system to backfire, the overall effect is the same. com - Duration: 22:35. Poping back through the carbs is usualy an indication of either a lean mixture, a vacuum leak or a leaking valve. In addition, if the fuel level in the float chamber is set too low, insufficient fuel will be drawn through the main jet. I had one going bad in my old truck (88 f150 converted to carb) it would get real hot and hard to start. The name itself comes from the first carbide lamps that used a small hole to drip water on carbide rocks. Ran like a champ at 3200 rpm for the first 30 minutes, then started backfiring through the carb every 10-15 seconds. If I remember correctly I had a single wire that came off the coil (don't remember where it went to) that had a splice in it. Posted by Anonymous on Jul 16, 2014. If the pilot/slow jet is correct it will be easy to maintain a steady speed. 400ex backfire through carb help. 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 has the Rotax 500 engine, same as the old Traxter/Quest. when it spits and backfires is when i pull the choke. If this does not work, you may want to remove the carb and take it to the shop for a professional look. Now I know its not a mini but an engine is an engine and the basics are all the same which is why I posted here. but ive always had the problem with bogging but the backfire is new also when the car is just sitting in my drive way idleing i can press the gas and a little puff. i,m working on a gator that is spitting fuel out the carb. I can let go of the throttle and it'll settle back to idling. To date I have cleaned out the carb (several times), replaced the rubber 'O' ring at the carb/manifold, adjusted the air/fuel mixture screw from 0-2. Still backfires and won't idle. These should always be at least checked every 500 miles or so. You could just run some carb cleaner through the carb first before taking the carb out and doing a good cleaning. The name itself comes from the first carbide lamps that used a small hole to drip water on carbide rocks. When I hit the throttle, (while sitting still in neutral) only one slides open (the one closest to the battery), and it barley opens, and the carb backfires through it. I had one going bad in my old truck (88 f150 converted to carb) it would get real hot and hard to start. 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. Here’s a chart that shows what controls what with each change in RPM (thanks again to JustRandy):. Then re-assemble the carb and try the quad again. Drain your float bowl first, it sounds like you have some old fuel in there that has gelled up, and change your fuel if you haven't already. Backfiring happens all the time, in cars and bikes, you just don't hear it because the muffler/exhaust. Engine is backfiring intermittently. For engines to run efficiently, the spark plugs have to ignite the air and fuel at the right time. FIXED! new engine popping/backfiring under load it did it with my edelbrock 1406 and edelbrock q-jet. Carburetors. Recently my grizz has been popping/backfiring back through the carb at low rpms. · atv backfire, atv backfire through exhaust,honda atv backfires, honda atv backfiring, quad backfiring. I bought a 360 prairie that was having a problem with a backfire through the carb. 4: Backfires in Exhaust 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. If I remember correctly I had a single wire that came off the coil (don't remember where it went to) that had a splice in it. It also does it sometimes when I let off the throttle. if so what was it. 3) Replace the power valve. or you need to adjust the valves, i dont think that would have anything to do with back fireing but maybe with it slowing down, stage three of the clutch may be gone, which then you would need to get a stage 3 hot cam or a new. But, it would not rev cleanly, and was backfiring through the exhaust. Still have the surging and. but ive always had the problem with bogging but the backfire is new also when the car is just sitting in my drive way idleing i can press the gas and a little puff. I then installed the assembly using the Warrior throttle cable (P. I've cleaned the carb and even tried a different carb to no avail. I turned up the idle screw a bit and it stopped backfiring, unless you tried to choke it, then it would backfire. It doesn't run despite having a good spark, if I turn it over with a drill I get occasional backfiring, it is definately backfiring as the drill jerks and slows when it goes pop. A Kawasaki lawnmower engine that backfires on start-up has a problem with fuel delivery through the idle jet. Carburetors. Now when i first start it up it pops and backfires through the carb. 2001 Big Bear 400 backfiring/misfiring It will rev in neutral fine and 1st gear, but I barely give it fuel in 2nd and it starts backfiring and guys behind me said they can see black smoke. Fuel can not flow properly through a dirty carburetor; this will cause a lean-running engine. 400ex backfire through carb help. Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum > Honda Model-Specific: General, Technical, and Performance ATV Forums > Foreman 450 > Lean, backfire through carb, bad idle, 03 foreman S. changed the. I took carb off and cleaned it even though I just cleaned/rebuilt it a couple weeks ago. Since I am reckless and like living dangerously, I never do this. Still have the surging and. Hey odan ,, ya i checked all that too ,, i read up that the polaris 500 had that problem ,,, -- BUT -- i think i found the real problem now ,, The buddy i bought Grizzly from told me he tried another STATOR in it at one time ,, so i took the stator cover off and 2 wires that go to a black box was all hacked up and not covered very good ,, both wires were just hanging out hitting each other and. Backfiring out the exhaust, fouling plugs, and black smoke are all rich conditions, go down in size. The heat from the pipes then ignites the vapor and boom, backfire. So I now know its running a little rich, amd more adjustment was needed. Outdoor Gasoline and Electric Powered Equipment and Small Engines - Honda GC190 backfiring through carburator won't start - I've got a Northern Tool (NorthernStar) 2700psi pressure washer with a Honda. It idles fine and the problem doesn't go away when the Reverse Overide button is used. Here are some causes of that delayed detonation that may clear it up a bit more. Carburetor and Fuel System Troubleshooting Guide. Adjusted needle for best idleturn clockwise until it stops and then out 1. these symptoms usually point toward lean on fuel for some reason most common would be dirty or gummed pilot circuit and pilot jet I would remove carb and take out the pilot jet clean or replace with new - blow compressed air through the hole the pilot jet came out before reinstall. But since most of those guys are out wheeling while im stuck in my office today, see if this helps. Went thru the carburetor, correctly set the float, rebuilt the carb with a full kit. It will pick up speed with the throttle, but not very well. or the jetting is off. I did have to get one replacement after purchasing one cause a small rod was broke off the first one, but the second one was Great, I did have to adjust the needle on it cause of where it would not run in half throttle and would backfire though the carb. i'm at my wits end trying to figure this issue out. Outdoor Gasoline and Electric Powered Equipment and Small Engines - Honda GC190 backfiring through carburator won't start - I've got a Northern Tool (NorthernStar) 2700psi pressure washer with a Honda. The fault is similar to the one shown by a carburetor with a faulty accelerator pump. Polaris atv backfires and starts cutting out when depressing thumb throttle, even out of gear? Idles great. 99 eBay determines this price through a machine learned model of the product's sale Arctic Cat ATV Carburetor Carb Primer Cover 98-01 400 98 454. It wasn't clear to me from the original description. Re: Backfire through Carburator at high RPM I cleaned the carb and it was in perfect shape, compressed air and blew it all out. So I now know its running a little rich, amd more adjustment was needed. Then when I tried to start it,it backfired through the intake. Is it backfiring through the exhaust or carburetor? Does it run better with the choke on? If so then I would look into the carb issues paw mentions: clogged pilot jet, torn o-ring etc. Backfire is a condition described as a loud bang, poof, explosion, etc. Make sure your coil is plugged in all the way ; Check to ensure you re getting spark. I have already replace the head, flywheel key, cleaned out the carb and bypassed the fuel filter. com FREE DELIVERY possible on eligible purchases. Chevy 350 Backfiring Through Carb? 1996 Mercruiser Magnum 350 with the original Carter carb professionally rebuilt. Like I've said it sounds almost like it's trying to backfire through the carb. Many people have this problem with their engine with ATV backfire. 2) The combined effect of the closed throttle and elevated engine rpm is to create a fairly strong vacuum in the intake manifold. If the carb is out of the warranty period and no defect is determined we will estimate the possible cost of tech support or recommend literature available that may help. Re: Backfire through carb when accelerating I think the key to look at is it does it at acceleration, both hard and light, and more after it idles for a bit. Carburetor Hats. The RZR570 runs a bit on the lean side from the factory and can have some backfiring under decel. This part was the problem solver and now the Baja is running faster than ever!. I went through two of them on this. Here's a chart that shows what controls what with each change in RPM (thanks again to JustRandy):. The digital book covers all aspects of maintenance and repair. Backfiring that results from damaged wiring disrupts the ignition's timing, which causes a build-up of air and fuel in the engine. Hi folks! The last few days, my KMD 150 GY6 would start dying at intersections and give an every-now-and-then backfire. What Makes a Car Backfire? Backfiring is the process of a spark plug, or multiple spark plugs, igniting the fuel in their cylinder out of turn, in a part of the combustion process where the exhaust valve is open on that cylinder. The moving air going through the carburetor will pick up fuel and mix with the air. The backfiring through the carburetor (the coughing or spitting), on the other hand, frequently happens in the morning when the carb’s air/fuel mixture is too thin. I'm willing to help if you need some guidance. Sounds like it might have a air leak somewhere and could be leaning out, we had the same kind of problem a few years ago and I FINALLY found a leak around the exhaust flange. Has new fuel filter and checked all points on distributor cap. If you can see through the jet it isn’t clogged. A "constant velocity" carburetor (CV carb) is used on most four stroke scooters (Honda Elite CH125, 150 and 250 and on the smaller Elite CH80 as well as the 50cc Ruckus and Metropolitan/Jazz scooters). 2004 YFZ 450 carb question First a brief background on what I have. Have you checked to make sure your float isn't stuck closed and not getting any fuel. We've searched far and wide for an expansive array of listings in stock now. But, it would not rev cleanly, and was backfiring through the exhaust. Might try removing the adjusting screw, then passing a very fine wire through the hole to dislodge any gum or dirt. You can also determine if you need to jet the carb based on how the bike rides. I turned up the idle screw a bit and it stopped backfiring, unless you tried to choke it, then it would backfire. RE: Atv is backfiring through carb. Common causes of backfires are: Wankel rotary engines are known for leaking oil into the exhaust system which causes backfire. Either way a leaky fuel bowl on your carburetor, probably isn't going to end well. I have had it bored out with new rings and new valves and a timing chain. My quad is a 2004, it has an Athena big bore kit with standard compression piston, ported and worked over head, GYTR exhaust and the air box with the mesh style lid with a foam filter and prefilter. and a good cleaning of that wouldnt hurt anyway, or you arnt running high enough octane gas in it. 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). I also pulled the plug and it was really black. Adjusted needle for best idleturn clockwise until it stops and then out 1. 10 minutes ago · Recent 1996 Honda VT 1100 C Shadow Spirit questions, problems & answers. Deprecated: Function create_function() is deprecated in /www/wwwroot/www. The car prior to the carb being rebuilt was running rich and after the rebuild seemed better but then starting running rich again. Tips to Prevent Backfire. I then installed the assembly using the Warrior throttle cable (P. Wiki User 10/31/2010. The best thing about the Carb is the person that I bought it from on ebay, the Carb is fine also. When I hit the throttle, (while sitting still in neutral) only one slides open (the one closest to the battery), and it barley opens, and the carb backfires through it. Polaris atv backfires and starts cutting out when depressing thumb throttle, even out of gear? Idles great. Hesitation under heavy throttle: Deadspot & stumble. can-am ATV Forums - can-amtalk. Ran like a champ at 3200 rpm for the first 30 minutes, then started backfiring through the carb every 10-15 seconds. Still backfires and won't idle. Poping back through the carbs is usualy an indication of either a lean mixture, a vacuum leak or a leaking valve. This same engines is used in other ATVs and dune buggies. Ended up going through everything I knew how to (air filter, bad gas, etc. or the jetting is off. 2001 Polaris Sportsman 400 atv with backfiring out of the carb at high rpms. Arctic Cat 300 Carb Adjustment 2000-2012 Models INSTANTLY DOWNLOAD Arctic Cat ATV repair manuals straight to your computer in seconds. the extra oxygen causes the super heated gases/unburnt fuel to ignite only for a fraction of a second causing the popping noise you hear. Carburetors. Can anyone tell me the distance that the rocker should move where it contacts the valve?. If your dirt bike tends to slough when you punch it and/or backfires when you open it up a bit, you're probably injecting too much fuel. Carburetor Adjustment amp Troubleshooting Series- Part 1 dialing in the idle circuit: ATV & UTV : Carburetor adjustment is another one of those great mysteries of engine tuning that some perceive as. Watch the video at the bottom to see a backfire taking place through the intake manifold, possibly from a vacuum leak. A faulty ignition system is a possible cause of a engine backfire. This morning I go out to try & start it, it cranks & cranks, sputtered a couple times, but won't fire up. com FREE DELIVERY possible on eligible purchases. It also does it sometimes when I let off the throttle. The carburetor regulates the flow of fuel and air to an engine. This carburetor is for the, made in China, Jianshe 250cc ATV. I have a Yamaha Wolverine 350cc, year 2000. Starts and runs fine at idle, runs way too rich when throttle opened. i just bought it over summer, took it out yesterday and after a little while of riding it started backfiring through my carb! now im at a dead end, it has good compression 120 in both cylinders carb is clean, it starts and runs, it dont bog out or anything, and the backfire only happens when u rev it up. I have a Scag Cougar with a 27 hp Kawasaki FD750 S04 (with 350 hours) that idles fine, and drives fine, but a few minutes after it's working under load, mowing, it starts to slow down then backfires non-stop, till I remove the load. I can let go of the throttle and it'll settle back to idling. Went to camp to ride and bike started running like it was running bad. ? I have a 06 raptor 350 and recently i added a jet kit and a pipe. THIS WILL NOT FIT OR WORK FOR ANY OTHER MACHINE BESIDES 1993 - 1995 KODIAK 400. moving it several turns seemed to have no effect on idle smoothness. carb back in on Friday and it started right up. Hey odan ,, ya i checked all that too ,, i read up that the polaris 500 had that problem ,,, -- BUT -- i think i found the real problem now ,, The buddy i bought Grizzly from told me he tried another STATOR in it at one time ,, so i took the stator cover off and 2 wires that go to a black box was all hacked up and not covered very good ,, both wires were just hanging out hitting each other and. For engines to run efficiently, the spark plugs have to ignite the air and fuel at the right time. You could just run some carb cleaner through the carb first before taking the carb out and doing a good cleaning. When I hit the throttle, (while sitting still in neutral) only one slides open (the one closest to the battery), and it barley opens, and the carb backfires through it. changed the. Replaced them , works great now!. It wasn't clear to me from the original description.