Posted by Charles on 5/1/2008, 9:33 pm
68.122.193.86
I was recommended by my engine builder to use Champion C57 but they only seem to last a weekend (2 hours) racing and then the engine starts spluttering above 5000 rpm (I can go up to 7000 rpm). I replaced them with regular NGK plugs and every thing works fine. What plugs do you racers out there use?
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