Hey, i am more than sure gray racer could tackle this question . he should be on jepardy i swear he knows all. Im wondring if this could be an exhaust leak. or something else. (jetting or valves or carb) this started to happen last time i rode at gorman and it started to sprinkle. i noticed on downshifts and hard decelerations the bike wants to pop and backfire. is this an exhaust leak or due to humidity in the air. it was cold tonight when it was doing it also.