Posted by Bob on August 01, 2008 at 12:29:37 from (69.178.228.68):
In Reply to: Oooppppsss! posted by ScottyHOMEy on August 01, 2008 at 11:02:11:
Scotty,
As you know, with a distributor, position of the drive slot @ TDC really doesn't matter, as the distributor can be timed to compensate.
HOWEVER, with a mag, the drive slot needs to be darned close to horizontal @#1 TDC, or there won't be enough adjustment in the mag mounting slots to compensate. Probably better not be more than a tooth off either way of horizontal.
If you have a spare mag, you can see this for yourself. Clamp the bottom of the mag flange in a vise. Then, grab the drive tab with a ViseGrip, and slowly wind up the impulse spring, and note that the impulse trips when the drive tab is horizontal.
This is an almost universal situation, 'most ALL old engines have their mag drive slots horizontal @ #1 TDC.
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