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way off topic engine question.
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06-10-2012, 12:18 PM
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two_wheel_mayhem
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Drives: No car no more
Join Date: Jul 2009
Location: Indiana
Posts: 2,750
Generally one heat range cooler if it's a big CC 'meltdown motor' bike but you aren't very specific.
In most cases stock plugs work just fine in N/A motorcycles.
two_wheel_mayhem
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