I have a 06 raptor 350 and recently i added a jet kit and a pipe. Pull the carb off and clean it really good. NOW....it will not idle on it's own and the hiccup has gotten louder (now I'd describe it as a backfire through the carb). Could it be the idle jet id clogged again some how? My buddy has a big bear 400 that is spitting back through the carb at idle and just above idle. I can pull out the enrichener knob maybe halfway and it takes care of the problem. Runs bad, backfires through the carb. Jump to Latest Follow ... Oh and I just wanted to add that I checked the carb to cylinder boots and there was some small cracks in them but they did not appear to go through to the inside. A backfire results in a temporary loss of power and forward motion along with a loud ATV Riders Forum > Sport ATV Model Information > Honda TRX 400EX & 400X ATV Info > Backfiring through the carb after rebuild. Dual fire ignitions fire front and rear cylinder spark plugs together. 02-09-2010, 04:50 PM. Deceleration back-fire, rough idle, and throttle lag can be quickly adjusted by tuning your carburetor. Think of it like this. Could I have a bent valve somehow? It ended up I was at around 16.1 and getting a lean condition. A carburetor backfire describes the small explosion that sometimes occurs when starting up a car. If the ATV has bee sitting for quite sometime, ... My Big Bear 400 starts popping through the carb after it warms up and runs for a while. Backfires get their etymology from firearms parlance when explosive force is released Improper carburetor adjustments or vacuum leaks can cause this condition. View Full Version : Backfiring through the carb after rebuild. try a hot wire from the bat to the distributer to make sure it aint your harness if its poppin through the carb maybe its an intake valve stuck bent or lobe worn. ATV Tech Tips. All the gas that was being pulled through the main jet is now not working because the needle is blocking the main. only when you hit gas does it pop? It is a 300 bayou 4x4. I also had a slight hesitation when cruising at around that rpm then feathering the gas. hi, i have a 99 yamaha warrior, i bought the quad last year, ran awesome, stored it away for winter, took it out this spring, it will start and run like it used to do, but when i touch the throttle at all, it boggs out and backfires and shoots flames out the pipe. He let me take it for my kids to put around the yard on but it will not run. ... popping back through the carb means its to lean..... eprovenzano. Late 80's model. I … One of the sparks starts combustion while the other is ìwastedî in other cylinder which is not on its firing stroke. I had a little time today. According to an "ATV Rider" 2009 article, "When the Grizzly was introduced in 1998 as a 600cc machine, the top was blown right off the displacement wars of the time." Popping noises from a carburetor indicate a form of backfire. Its back firing through one carb more than the other one and back firing through the exhaust. Too much air and not enough fuel causes backfires to occur in the intake manifold. it only does it when it is idling and at low speed cruising. Couldn't find any discussion about an occasional popping through the carb at idle or low engine rpms. It was replaced in 2002 with Yamaha Grizzly 660, an even bigger engine derived from the well-established all-terrain vehicle (ATV) Yamaha Raptor 660R. Cody Burge’s twin supercharged, ULTRA4 car that he brought to Holley LS Fest is one of the highest-horsepower cars in the class and certainly turned some heads. I want to tune my carbs (yes, I know that the B34s are notorious for being lean in the first place). 20+ members. Oil in the air filter box - Answered by a verified Motorcycle Mechanic. The popping is a result of the air/fuel mixture becoming very lean when the throttle is closed and the ... causes a high air flow rate through the small gap formed by the throttle valve and carburetor throat. Join now to ask and comment! It’s not uncommon that ATV-owners find themselves with a machine that won’t stay running or won’t run properly. New gas and plugs isn't a bad idea either. Can start run fine for .25 mile than starts dying small amount backfire. Reving my motor steady at around 2400 rpm or cruising I get an intermit slight popping sound out of the exhaust. It goes through the gear but won't show 1-2-3-4-5 .. You are cruising along and then close the throttle. There are two fuel and one air. In my how-to video I will walk you Atv is backfiring through carb.? Clean everything with spray carb cleaner and run some small wire through all the jets you see. This things about to drive me nuts..... For several weeks my Rhino has been acting a little funny when I first start it up....hiccups a bit before it warms up, then it runs fine. ULTRA4 is the run-what-you-bring, no-holds-barred class that started King of the Hammers. It won't hurt to take it out and give them a good cleaning and shoot some carb cleaner up the circut with it out. I got had it up to a jumper and had it turning over fast, it kind of started to fire and it did for a split second but with a LOT of loud popping from the exhaust and out the carb. What would cause popping through exhaust? Brute 750 popping through Carbs and Exhaust. It generally makes a loud sound, like a gunshot, … We we cleaned the carb including the jets, adjusted the air screw from 2 and a half out to 3 turns out and nothing changed. So all that air that is still being sucked in by the piston going up and down has to pull fuel from somewhere, so in your case it pulls it from the pilot … popping through carb..... Jump to Latest Follow 1 - 8 of 8 Posts. Sometimes the ATV won’t run at idle, or it may bog down when applying throttle. Fuel To Air Mixture Is Too Lean. ... Mud in My Blood ATV Forum 26K+ members. ... Have a 2007 Sportsman 500 ATV that runs intermittent. The smallest fuel, and it should say #40 on a 650, is the pilot jet. Some find that their ATV starts and runs fine, but only for a short time before it shuts off. Carb was rebuilt and checked a couple of times, but still does it. It sounds like your idle jet is clogged so you have to hold the throttle open to start flowing gas through the next circuit but you're still not quite getting enough causing a lean condition which is causing the popping. Honda ATV Technical ... Did you clean out the passageways in the carb body? We use cookies to give you the best possible experience on our website. It's doing the same thing. Popping on deceleration is normal. This, in turn, results in backfiring through the open intake valve into the intake system. BMW i5 Forum NEW! Yes I know it's running rich, I don't know why. I adjusted the valves to .06mm to .10mm intake and .16 to .2 exhaust. It is jetted like it said and the fuel mixture screw is 3 turns out like the instructions say. The exploding mixture then vents through the carburetor. Racing consists of rocks, sand, and all other manner of intimidating terrain, and speeds above 100mph are the norm. Hi, new member but have been checking out the forum for a while. Take the air box off and runn it in nuetral and see if gas is shooting out of the intake of the carb if this is so and its poping through the carb you have a bad exhaust lobe on your cam and the rocker is toast as well about 3-400 in parts and about 6-7 hours labor ( hint) if your good with it get a book do all the major stuff your self and take it in and have the vavles adjusted Starts up and idles good, once you start giving it throttle it … PDA. I have attempted adjusting the pilot screw, which did alleviate the Since then my carb has been sounding like it is backfiring. There are few things that get my heart pumping like the shock of hearing a backfire when I’m out riding an If the carb is jetted correctly this will solve the problem. Backfire Causes and Cures. I have abuddies wheeler at my house. Hey all, I work for a fleet shop and we have a lifeguard ATV its a Kawasaki brute force 650. Popping/crackling through the carb during acceleration, cam, compression, or what ... than every body else. I'm from memphis tn and got a 2002 450 foreman es.. And I have cleaned the carb like 2 times and even tried an oem carb off a working bike and new spark plug and no change.. Also my screen won't indicate what gear I'm in.. Just the green and red light.. Some carb popping but mainly exhaust popping and backfiring. Completely rebuilt a 96 400. Sorry for not introducing myself lol. Reason for the carb to do that is that it is running lean - causing a backfire or popping through the carb. I cleaned the carb, put new gas in and checked the plug. F. Frank ... the problem is the carb is apparently too lean as I POP through the carb at low RPM when I take off from a stop or apply too much throttle at low speeds. An engine backfire is an explosion produced by an internal combustion engine. does it idle ok? 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