771cc XScream Engine Short Block

Product Description:
Our 85mm Big Bore is where the real fun begins. We transform an OEM 61x cylinder from an ordinary 701cc into a 771cc arm yanker. Utilizing the stock crank means this is about as low maintenance as you can get. Great for surf and amateur class legal boats. This was the package of choice for team rider Michael Ratti to compete with in the '06 & '07 full seasons. We provide tuning recommendations and support to ensure complete satisfaction with our engine long after delivery.
The BB771 is also available as top end kit.

BB771 Short Block Features:

XScream Freestyle Cylinder Porting
Modified Yamaha 62T cases - Includes XScream epoxy and finger port work, reinforcing front seal area with epoxy, installing a second pulse line fitting and fly cutting to accommodate the larger sleeves
XScream Big Bore Sleeves (84mm to 86mm bore)
ADA Girdled Head
Wiseco Forged Pistons
Custom cut domes for pump, aviation or race fuel
OEM Yamaha 701 Crankshaft
OEM Yamaha Crank Seals

BB771 Piston Options:
84mm, 84.5mm, 85mm, 85.5mm and 86mm Wiseco Forged Pistons