Blaster need help - new motor/pipe whats wrong?

I put a raider engine (62t/62t) in my blaster. I also installed Factory mod pipe. The manufacturers have different recommended carb settings for raider and blaster. I have tried each and both end up running bad. The ski will run good on the hose and on the trailer but when I ride the ski it has no power and revs maybe to mid rpms with full throttle. I rebuilt carbs and currently have 142 mains and 70 pilots. Please any feedback. I have tried everything I can come up with and no luck. Is this combination of motor and exhaust just not gonna work well or is there any adjustments on carbs that I should try?
 
Top Bottom