I HAVE KFX 700 WITH ALIEN DUALS WITH QUIET CORES, STOCK JETS, 3 TURNS ON CARB AIR SCREWS, ( PER DMC ) AND I AM HAVING MILD BACKFIRING ON DECELERATION. THE PROBLEM WAS WORSE WITHOUT QUIET QORES AND WITHOUT AIR ADJUSTMENTS. I HAVE TIGHTENED ALL THE BOLTS ON THE EXHAUST BUT THE BACKFIRE CONTINUES. THE 700 RUNS GREAT AT THIS ALTITUDE ( DENVER, 6000FT ) ANY SUGGESTIONS?

 

DMC has the biggest bunch of retards working in thier tech dept..
Adjust a/f screw out another 1/4 turn, adjust the idle and give it a shot
continue until the pop is gone...

 

THANKS FOR THE ADVICE. I WILL TRY THE AIR ADJUSTMENTS, BUT WHAT DOES ADJUSTING THE IDLE DO TO STOPING THE BACKFIRE?

 

think about it this way, if you let off the throttle then it closes the slides and sucks gas like a choke , and if the exaust is hot then it lites the residuale charge of fuel/air, thats what causes the back fire in the exaust. the more air in the exaust then the greater the chance of back fire.

 

THAT I WHY IM JUST A NOVICE? I LEARN AS I GO AND HOPE NOT TO STEP INTO ANY LARGE HOLES. THANKS