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Not a prop question! 12 years 2 months ago #69711

  • Normspeed
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My 64 Merc 65 hp came to me with Champion J6C spark plugs. They are gapped at .025. Does that plug number sound OK for that motor? It starts and runs OK but I'd like to go with a recommended plug.

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Re:Not a prop question! 12 years 2 months ago #69725

That plug is what I run in all my magneto driven Mercs... I'd up the gap to .030, though...

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Re:Not a prop question! 12 years 2 months ago #69732

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Thanks Chinewalker.

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Re:Not a prop question! 12 years 2 months ago #69747

merc recomended j6j now j6c's gap is .025.

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Re:Not a prop question! 12 years 2 months ago #69758

Thats what I have for my '63 850
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