backfires

[firemanems06]

i talked to some guy from technical support.. it didnt sound right to me either.. and if it ws caused by too much unburned fuel, i would think it's running too rich.. i'll just get it dynoed

[DTOLL]

And Then!!

[smokejr]

I think the dynojet guy might be right, if you read any sportbike forums, you will see this
comment alot, alot of bikes and quads in the US don't have O2 sensors in the exhaust
like all EU bikes do, so they rely on a cat in the exhaust to burn the extra fuel and
reduce backfiring, so whenever anyone changes there exhaust without adding a
FI controller always ends up with backfiring, maybe not the same on our quads but
it sure sounds like the same issue.

[mdskfx]

i see that this is an old post from 08 but here you go all ive had my quad since 07 and have only changed the silencer. It has never backfired on me till this past summer when it got rolled down a hill that i was trying to climb. after that it has backfired like none other and i have always used 92-93 pump gas its had the recall tank put in so the fuel pump best not be out (as i doubt it coz it still runs) i would have to say its the TPS or some other sensor that has been tripped but any ways hope the problem has been fixed by now or you have another quad