quick question
 

I upped my main jet to a 88 but it seems like my idle is a bit lean since I've put the performance air filter, have most of you had to up the idle jet to something bigger? Or is it just me? And ya eventually I am going to up the bore to a 85cc bore, with a 44mm crank.

Can you access the idle mixture screw? You may just have to turn it out to compensate if the main jet is running correctly.