Reply To: Substitute for Champion J-8J spark plugs

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June 18, 2025 at 10:58 am #297393
NATHAN KILLIAN
Participant

    US Junior Member

    Those are the Champion J8J spark plugs and not the HJ8J or J8C spark plugs?  I bought a few HJ8J thinking they were the same, but they have  a smaller thread.  If they are the regular thread J8J spark plugs I would be interested.

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