Most tractor mags fire at or very near TDC while the impulse is engaged (cranking), then advance all at once to about 25� 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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