Jetworks 771 Big Bore Top End Kit

The classic Jetworks 771cc Big Bore has been around since the 701 Superjet was released. This engine modification converts your 701cc 61-X cylinder into 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 have given our 771′s a reputation second to none. This modification works killer with a set of Blackjack 44mm carburetors and also works great with our T.T. 38mm carb mod.

We have had numerous customers "downgrade" from larger billet cylinder setups that would consistently have issues of power delivery or reliability, and switch to one of these and have never turned back, stating that it runs better than their more expensive setups and was easier to ride, even one of our customers who used to ride with a Pro Rickter rider they swapped skis, both on the same Rickter hull, one using This 771CC Big Bore with Dual Black Jack 44's, and the other a 1000cc 8mm strocker engine, and our customer came back saying, "theris probably less than a 2% difference!

Big Bore 771 Big Bore Top End Kit:

• Removal of OEM sleeves
• Custom Jetworks Big Bore Sleeves & Installation
• WSM Performance Pistons
• Cylinder Porting & Honing
• Cylinder Boring & Counter Bore
• Cylinder Decking
• Chamfer Of All Ports
• Base Gasket & Wrist Pin Bearings
• Base gasket and wrist pin bearings

Available Starting Bores:

• 85 mm @ 771cc

Replacement pistons also available in:

• 84.5 mm
• 85.5 mm
• 86.0 mm

Requires crankcase boring to accept larger sleeves.

(Optional crankcase porting)

This is a service modification done to your 701 61x cylinder. This is not an "in stock" item.

Full engine assembly is available.