Why is my atv backfireing

Preventing Backfire on Motorcycle Exhausts ' DoItYourself ...

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When the engine on your motorcycle has an emission system malfunction, such as anexhaust leak or a moment of running rich or running lean, backfire can ...

Exhaust backfire, popping when letting off throttle - Motorcycle Forum

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Apr 26, 2009 - 28 posts - ‎17 authors
Exhaust backfire, popping when letting off throttle General Motorcycle Discussion. ...You can damage the engine by running too lean or rich. Backfires on deceleration
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At my wits end! Backfiring and fouled plugs on ...
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Glad That You Asked. Why Do motorcycles Backfire? at Cyril ...

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Jun 12, 2010 - A visible flame may momentarily shoot out of the exhaust pipe. ...Another backfire situation occurs when the engine is running rich, meaning ...

Is backfire when decelerating a bad thing? : motorcycles

it sounds like its starving for fuel, when it runs lean you will get backfires and if its running rough then it may be starving for fuel at idle. Try adjusting you mixture screw and see it the engine will smoot out. Your carb my be dirty and not allowing enough fuel through it.

It is pretty normal for many engines to backfire while decelerating. Bikes have much shorter exhaust and much less sound control so it is much more obvious. If it is running good while idleing and while accelerating it's probably not a fault.

sounds like fuel and air mixture isnt right

Carb is gummed up

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timing plugs or leads or could be exsesive fuel
leaking valves

That is a car not a motorbike. Bikes only have 2 wheels. But you may want to set up the cam and ignition timing. it is only timing that will cause backfires.

is it a straight thru exhaust, or is it just a head pipe with nothing attached? If it's just a head pipe, you need to get some sort of muffler on it or you'll burn your valves out from a lean condition. The backfire is due to the vaccum fed carbs that yamaha runs. They work wonderfully, but under heavy deceleration, the vaccum still feeds the bowl, and it builds up excess fuel, which eventually burns off as a backfire. If it were fuel injected, you could have the fuel map adjusted to lean it out under deceleration.

May be running too lean or too rich. Check the color of your plugs, black dry and sooty means they are rich, white with blisters lean.

Check for exhaust leaks. Esp Leaks toward the front of the car. Hold your hand over the tail pipe using a rag and see where the loud hissing noise comes from. Repair the leaks and I bet the backfiring goes away

Good Luck