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my 03' 600 mxz twin, is runnin way rich, to lean it out a bit, its just a matter of swapping the main jet or something like that in the carb to a jet with a higher number no??
 

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Depends what circuit is rich, your main jet is top end, needle and mixing tube is mid range, air mixing screw and pilot jet in bottom end, any adjustment can change the way you machine runs, not to mention possibly engine melt down.

Where do you think it is rich? (idle??) or (WFO??)

Its also warm out still, temperature can do alot with jetting as well

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