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F-M K4B MAG

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Author 
BILL

03-26-2000 08:15:15




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I have a '38 B w/ an F-M k4b magneto.It has a hot spark and seems to work o.k. except I can't get it timed correctly.I've followed the manual time after time but it seems to fire late,not at the flywheel mark.Do I need an F-M J? Is the impulse able to be locked out,like an I-H mag?It seems that is where the problem is-the auto impulse cancels out any advance or retard of the timing .At low RPM,it runs o.k. but at 1/2 to full throttle it sounds like a johnny popper. Can it be a carb problem,condenser,points? These all seemed o.k. I thank in advance for your help

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