Not Ranked
We are considering that the backfire may be from sticky exhaust valves as we also changed the cam and valve springs. I am pretty sure that the carbs are not too rich. Most people on the site seem to run 65 idle jets and 160 -170 mains. I am running 55 idle jets and 160 mains. Should be fine. Plugs are clean and doesn't smell rich. Pretty sure it has to do with the cam or valves. But not sure at all.
Zimmy
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