motor will not increase in speed . complete fuel system basicly replaced from tank to carbs , at this point im ruling out a fuel problem . looks like possibly a spark problem , looks weak , sometimes not there at all , but motor still fires up and seems to run smooth untill you hammer it, it runs rough and will not speed up . have change power pack , timerbase , rectifer , and stator . these parts were changed with used parts . also changed ignition switch and battery , these were new . have done a compression test also checked ok . problem still remains the same .
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