well i bought this 88 shee in a box and rolling chassis...well i went threw it all and rebuilt everything and well im not sure where to start for the main jet since the quad had different pipes that didnt go with the shee so i got my hands on some stockers and threw them on but, when i got the cylinders back from the machine shop the guy said their had been a good clean up and small port work done...but he couldnt really tell me anymore than that...he told me to start with a main of 240 but he has never used power jets so he didnt know... i have 25 threw 30 for pilots and 210-240 for mains, the 1.6 air jets and the 1.4 starter jets r in both carbs with a stock airbox and a single k&n with the lid on and snorkle off... i live in michigan and i ride from 700- 1100 ft above sea level..how many jet sizes can the power jet be worth...its the set from fFAST. http://www.farmandsandtoys.com/partdetail.asp?partid=367 ... i emailed them but havnt heard anything yet ...so any ideas? thanx for any help ..