I would have a 30 pilot jet with that filter and vf4 and do a pkug chop with that main to see how it looks.
One thing to always keep up on is the electeical. Check your pickup gap and keep the flywheel nice and clean along with a new set of plugs. . I like to keep a .020" plug gap as well as check you plug cap resistors. 5k
Usually I just put some ngk ones on they are cheap..