what can i do? i just came back from a short ride on my cdn. wr426 and she backfired out the exhaust 3 times in total. my pilot screw came stock at 1 7/8 turns out and i have tried going in as far a 7/8 and out to 2 3/8 (the later seeming the best). Does anyone have any suggestions as to how i can eliminate this backfire completely. thanx in advance. matt.