Posted by Theman on April 08, 2009 at 09:08:29 from (63.107.135.35):
In Reply to: Re: Magneto timing posted by ScottyHOMEy on April 08, 2009 at 07:01:59:
Scotty, The H4 magneto impulse coupling (where the lag angle is determined) turns at crankshaft speed. So 35° advance for the impulse will fire the spark plug at 35° BTDC. One thing to watch for: Some H4's were designed to only have a 15° lag angle. There will be an X or Y stamped at the end of the serial number and on the impulse cap on those.
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