Rapture Posted June 27, 2015 Report Share Posted June 27, 2015 (edited) Just jetting my shee as the last part of my build. Started off with 300 mains and 27.5 pilots, 4th clip from short end. - Idled nice, but the air screws didn't really do anything if i screwed them in or out. It drank a lot of fuel and seemed to back fire after i let off full throttle. Changed to 280 mains and 25 pilots, middle clip. - Idle seems to go high after its been reved for a bit. (i think its lean). Still backfires when letting off full throttle. 40:1 mix, sea level. DMC 916's, no airbox lid with K&N filter. About 75F here. Would you say middle clip is about right? Whats up with this back fire? Also there is black oily residue at my exhaust. Any suggestions please? Oh, and just make sure ... as you move the clip towards the short end it leans it out right? Edited June 27, 2015 by Rapture Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted June 27, 2015 Report Share Posted June 27, 2015 Backfire could be because of air leak or ignition components Quote Link to comment Share on other sites More sharing options...
Rapture Posted June 27, 2015 Author Report Share Posted June 27, 2015 Actually i don't think its back firing, just "popping" deceleration. Quote Link to comment Share on other sites More sharing options...
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