back fire

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.

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