K&N jetting

When you guys put on a k&n fillter do you change the jetting and what do you change it to on a YZ450F 2006. Thank for your info.

It shouldn't affect the jetting, but you may need to give the fuel screw an adjustment. Keep that K&N oiled well. Lots of people on here have seen them pass dirt into the carb. :thumbsup:

any increase in performance?

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