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You can't have too much clearance between the pistons and valves. Some motors are even "zero interference" so even if the valves got stuck open, ths piston couldn't touch them even at TDC.
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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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