Mercury XR6 1992

by Greg dexter
(Burlington WI, USA)

I presently have NGK BU8H gapless plugs in my outboard. It has been fouling plugs lately. Ive read on other forums that i ran into accidently that i can help eliminate this problem by switching to a champion .040 gapped plug (QL77JC4). Can i use these plugs without damaging any piston tops?

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