Posted by Tom Fleming on April 13, 2013 at 03:49:50 from (67.20.233.75):
In Reply to: Magneto timing posted by Don Mountain on April 12, 2013 at 06:49:22:
Don, for the H4 application, there are only 2 positions that the mag drive can be in, the correct one, and 180 degrees out of time. If your timing is wrong, there are 2 places to check. One is the mag drive gear in the govenor. I spent 2 weeks scratching my head on an A that I converted back to mag from battery ignition. For the life of me, I couldn't figure out why it was out of time. Well, the PO didn't line up the timing marks on the governer gear when he rebuilt it. That is NOT an issue so much with a battery ignition, because you have unlimited timing adjustment by rotating the distributor. On a mag, you do NOT have the luxury. Anyway, took the govenor off and got the timing marks lined up and it worked like a champ.
Now, the other place you can get an H4 mag out of time is internal to the mag. The rotor MUST be timed correctly to the mag shaft. There are timing marks that must be in correct orientation. If you pulled the rotor cover off to replace the points, make sure you got it correctly oriented (timed).
Lastly, I agree with previous post, the internal mag timing has NOTHING to do with when the impulse trips.
I hope this helps a bit. if all else fails, send me a note, and I will be happy to provide my phone number to talk you through any of this. email shold be open.
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