You didnt say, but have you jetted your carb? I've got an 03 KFX with the FMF PowerCore 4, K&N, Jetted carb, Big Gun CDI. I went down to the 13 tooth since I ride wooded trails more than just straight haulin a$$. Big differance in low end. I dont do much straight line running so loosing a bit off the top really dident hurt my feelings. I ride the trails so much I dont even know if I have 5th gear anymore.
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