Re: 1966 FD 20 troubles

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February 13, 2016 at 4:52 pm #31890
Mumbles
Participant
    quote wannabe outboard guy:

    Mumbles, are you running J 4 or J 6 plugs in your FD’s?

    Neither. If the motor is being run hard, which I usually do, I go with the colder NGK B8S (J 4) and go from there. If the motor is being babied or it’s worn a bit and with lower compression, the slightly hotter NGK B6S (J 6) work well.

    As far as your motor goes, I’d attempt to save it. As long as the cylinder isn’t gouged above the ports, it should make good compression with a new set of rings and possibly a replacement piston.