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Turn the oil pump drive shaft with a 5/16" socket on a long 1/4" drive extension. Does it require more force at a certain part of the rotation? Now push down some on the shaft while turning, does it bind a bit more now? I would venture the guess that your oil pump is harder to turn through a certain part of it's rotation. The dist gears that had to push it through that part have worn out. Assuming the dist shaft is straight, the gear was normal, and such.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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