Backfiring at carbs

[coffinator]

silver,
Is it backfiring throush the carbs? If so I would say your mixture is to lean. If it backfires through the exhaust then your mixture it to rich. try that and see what you get.

mike

[SilverBullet]

Thanks Mike, I've tried to make rich the idle jet as backfire when idle, but still there, I'll try larger jets.

[mikko k]

Probably your flaps are a bit too much open. Close them a bit and open the pass by screws at the side of idle screws. About 1/2 turn to open should make a differens. Also the carbs sync have too be well done. Use air flow meters to do it.