Re: ignition timing on 34 1103

Posted by Needy '36 On 2009/5/10 0:24:56

Just a thought: Have you adjusted the carb-idle mixture screws lately? Backfire through the tailpipe (technically called an afterfire) when you're coasting can be caused by turning-in the idle adjustment too far, creating a lean mixture that doesn't ignite until it's in the tailpipe with hot exhaust.

If you get "pops" when you're off-throttle, try enriching your idle-mixture, and see if the backfire goes away.