Not Ranked
I think your motor is not balanced correctly. Does the shake come back at 4400 rpm? You did get the pistons balanced to one another, then the rods, then have the: crank, dampner, flexplate balanced to the bobweight of the piston/rod assembly, right?
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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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