Posted by Bob on December 14, 2013 at 10:02:18 from (64.255.159.192):
Jim, let me start off by saying I don't know the correct answer to this, and it gets brought up on here from time to time, with different answers.
You recently posted: "The first mark is the timing for advance, the second is TDC. there is no need for marks after TDC. Jim"
Couple of problems with that.
Factory "spec" is total running advance of 40º, (battery ignition) and the marks are too close together to indicate 40º of advance, and the IH Blue Ribbon Mag manual doesn't agree either.
It states:
NO explanation of what the second marks is for.
So, WHAT's the truth, here, inquiring minds want to know!
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