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  • Tom Christner
    Thanks for the respones. Since I posted the question I've read on a couple other forums where quite a few others were having the same problem with the knocking, which they're calling rattling. On those forums they were saying it was coming from carbon marbles rattling around, but it was normal for that blower. If that is true why are they not having the problem of those marbles lodging in the plug gap? Is my plug gapped wrong? I'm gapped at .025 as the manual calls for. Plug is NGK CMR7H.