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Yz125 jetting?

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I'm having trouble jetting my sons yz125 2001, the big carb year (38mm) he put a pro circuit platiume pipe with v-force 3 reeds on it. I stayed with the 460 main went to a 15 pilot and my clip is all the way lean. After 15 min riding my plug looks good bronze, tan top end is great but I still don't have the throttle responce i expected on the bottom. Should I start looking at the power valve or can I even adjust it ? ­čĹŹ

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