Your thoughts are exactly what I said in my kinda long post. That 2nd mark really only serves as an identifier to keep you from getting it confused with the other greasing mark.
The IT manual also does mag timing using only the TDC mark so that 2nd mark is not used even with a mag.
No chance you will ever use it for anything other than as a visual identifier if you have a distributor. Slight chance you might use that 2nd mark if you have a magneto (but even that will depend on whose procedure you follow).
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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