Jetworks 771 Big Bore Top End Kit
The Jetworks 771cc Big Bore has been around since the 701 Superjet was released, this engine modification converts your 701cc 61-X cylinder in to a big bore 771cc Engine. It uses your stock OEM crankshaft and offers a wider power-band with more hit everywhere in the RPM range. Our custom sleeves and proven porting configuration has given our 771′s a reputation second to none. This modification works killer with a set of Blackjack 44mm carburetors and also work great with our T.T. 38mm carb mod.
Big Bore 771 mod includes:
Removal of OEM sleeves
Custom Jetworks Big Bore Sleeves & Installation
Cylinder Porting & Honing
Cylinder Boring & Counter Bore
Chamfer Of All Ports
Base Gasket & Wrist Pin Bearings
Base gasket and wrist pin bearings
Available Starting Bores:
84 mm @ 753cc
85 mm @ 771cc
Replacement pistons also available in:
Requires case boring to accept larger sleeves.
(Optional crankcase porting)