Re: Spark plug confusion 9.9hp

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June 4, 2017 at 1:23 pm #58942
Don
Participant

    US Member

    Well, if you are using the champions, avoid the surface gap QL78V plugs. Either the Ql77JC4 or the QL82C plugs will work fine. The non inductor versions will work fine as well, and might be less expensive: L77JC4 or L82C, these might be tougher to find though.