I pulled the carbs off the zr and the mains were 430's. On the cat micro fiche it shows 430's but on the jetting chart it shows i should be running 390's. Im 0-2000ft mostly 0-20 degrees. What should I be running?
Try the 420's for 0-20 degrees. Mine ran pretty rich with the 430's @15*, went down a size and it made a world of difference.
But plugs are the only sure way, make sure to check them regularly when changing jetting, and keep in mind the temps you ride at
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