Quote:
Originally Posted by jpianalto
Sorry. It's a 147. I turned the main jet screw to the left some and it seems to have subsided but I know the carb isn't adjusted very well yet. I've never been able to get the needles right on this thing
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Find someone to tune it for you. An improperly tuned carb, can result in engine failure. If it is too lean, it can scorch the piston.
Intake or exhaust backfire?