i have a 2001 scram 500 2x4, i just had hot seat speed kit installed by local dealer, great improvement, but it backfires on deaccelleration , i have to take it back, but can any tell me the cause of this, am i running too lean? (kit included pipe and jets , clutch kit, and k&n)

 

Ive experienced this problem, it was from a small crack in the exhaust pipe. The crack caused a lack of back pressure which made the machine backfire. I'd recommend with your quad running look over your pipe carefully and see if there is any place exaust could be leaking out before to gets to the end of the tail pipe.

 

Yes, too lean. Try richening up the pilot one size. Chopping the throttle with when too lean will cause it to backfire like that.

 

I had this very problem with our scrammy
turns out I bent the mount slightly,,,and overstretched a couple springs

 

thanks, i always like to have knowledge before going back to dealer, any other input will be appreciated,. thanks, i dont want them to charge me for an adjustment they should have made when they installed the speed kit