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Basic Exhaust Jetting Changes

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In general, how does adding an after market exhaust effect the jetting of a bike? Obviously every exhuast and bike is different, but do they "in general" make the run lean or run rich? thank!!

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any time that you make a engine breathe better, either in or out you need to add fuel as well to compensate. so to answer your ? it leans out the mixture.:smirk:

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