Alright so Im jetting my carb, all I have is a fmf head and powercore 2 pipe and a k&n filter. At 230 it was deffently lean so I bought a 290, 280, and 250. It seemed like the 290 was too rich and it just bogged out at wot, and the same with the 280 and 250. I sort of pops and backfires and it just makes the quad unridable.. I can't figure out what to do, help please. Thanks