Reply To: Backfire/misfire thru carb

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September 11, 2020 at 7:00 pm #215617
Don
Participant

    US Member

    Those surface gap plugs usually look crappy like that…But, on this older higher compression V4, you need to use them…The J gap plugs are too hot for this engine/application… The turbo jet usually has two speeds, idle and WOT. Whereas a conventional propulsion outboard boat can usually be throttled back a bit to a reasonable cruising RPM.