i wish i could help more but i dont have a kx 65 or any clue as to the jetting. that link i sent you shows porting diagrams and explains all the goodies the factory techs do when you get or got your pipe. pro circuit should be able to give you a round about jetting for the bike but i couldnt find anything on it.
if you get it worked out you'll be able to help the next guy out
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