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Re: Something weird at 3500-4000 rpm
NGK BPRES6 or whatever are the plugs you should be using. Gap them correctly as jet said because you can get spark blow out. Don't get any Vpower plugs either. Make sure there is no number like *-11* after the main code. Also, make sure the number in the Part number is SIX, not Seven. You don't need that change.
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- Josh L.P.
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