Put a stock or aftermarket muffler back on it,then check to see if it needs jetting. 2" intake snorkles will rob power at mid to WOT,THATS WHY MOST INSTALL THE 3" INTAKE SNORKLE.More than likely the 2" intake and jetting is way off. Install a good muffler,pull the carbs and record the jets in each carb.then we can help more.
05 750,Stock Engine,Muzzy Pro Exhaust, Uni Air Filter,
14" Vision Bruiser wheels, 26" Kenda Bear Claw HTR,
3" PVC Intake w/restriction - 2" ABS CVT, center snorkels,Carbs Keihin-#40 pilots 2 1/2 turns out A/F ,#158/#158 mains w/30 thous. washers under stock NFKL needles, 2012 front suspension,
Mr. Gasket 42s Fuel Pump Mod
10" Hayden s-type Electric Rad Fan Mod - mod fan mount
Aftermarket ebay radiator