wouldnt hurt to put a cool head on it either well worth the money.. and it sounds like ur buddy was running it lean i like it a little rich im running a prodesighn 20 cc head with fmf golds power core 2 with fmf 270main and needle i beleave 30 on the other jet k&n with out lid and im pretty much wide open 1st and 2nd trail riding and hill climing... o and if u have a boost bottle throw it out