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    Mag side fouling plugs

    I have a 17 sb pro s 600 3200 miles runs great but been fouling mag side plugs. Will go 200 miles strong all day turn next morning foul a plug warming up. Comp is 115 both cly. I’m lost in what it could be like I said it runs hard and strong. Injector? Seal? Coil? Maybe just some sea foam ?


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