V1 spark plug

I just picked up a motion medalist.I am running a bh7s spark plug.I really think the Piston is hitting the plug.I did a search on here ,bit most people say bh7s.Is this correct?Or is there a shorter plug that is correct?It is a 1980.

Re: V1 spark plug

Try this: Remove your current plug and re-gap it to a measured .040in. Forty thousandths of an inch. Reinstall the plug and with the ignition OFF slowly turn the engine over ONCE. Now, remove the plug and measure the gap. Do you see where I'm going with this?

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