Whats the reccomendation for jetting increase on a k5,stock, from Premium pump gas/Cam2, to the VP U2(or equivalent)? I have a 168 in it now. Same for a 250? Any other set-up issues? I race against plenty of VP-fueled bikes, but it seems like they are all jetted funny. REAL FAT on idle jet(in the hole in neutral). They sound loaded up. Then they sound lean on top end. They even pop some when at top rpm's. Is that normal VP traits? I play ride the same bikes, so is there any issues other than jetting to think about when switching back and forth between fuels? What about a 50/50 mix of Pump gas and VP? A waste of effort and cash?