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Deleted member 12676
Guest
Find out the engines natural top RPM (speed) with the muffler pipe on.
Then if you have an expansion chamber put it on and then adjust its header length till you have the top speed you want, which could be equal to or anywhere around the natural speed, even up to 15% more.
Then adjust the CDI to improve on that speed a bit. That way the CDI is being matched to the engine/pipe and not the other way around.
Then if you have an expansion chamber put it on and then adjust its header length till you have the top speed you want, which could be equal to or anywhere around the natural speed, even up to 15% more.
Then adjust the CDI to improve on that speed a bit. That way the CDI is being matched to the engine/pipe and not the other way around.