Re: Mag timing with a timing light

Posted by Bob on December 11, 2008 at 18:03:22 from (69.178.228.68):

In Reply to: Mag timing with a timing light posted by 37chief on December 11, 2008 at 17:54:14:

Most tractor mags fire at or very near TDC while the impulse is engaged (cranking), then advance all at once to about 25º BTDC (the exact "spec", "lag angle" is specified by the engine manufacturer).

So, the flywheel timing mark is likely to be @ TDC.

You CAN'T advance the mag earlier than that or the engine will "kick", destroying the starter (which could be YOU)!

So, if the mag fires @ about TDC @ cranking, and the actual running timing is not "early" enough, you CAN'T advance the mag, but will have to rebuild the impulse and/or switch it to a unit with a greater "lag angle".

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