ok so what size jets should i run if i use the stock carb with this set up. fmf full system, k&n filter w/ prewrap, no lid on air box, vforce reeds w/ reedspacer?
There is no way to tell for certain without doing a plug chop to confirm but just *guessing* I'd say a 310 main jet.
Look at the beginning of the engine section for the "everything you'll need to know about a blaster" sticky thread. In that thread there is another thread about doing a plug chop to confirm jet size.