English Made Triumph 650 Unit Twins Big Bore Kit. If your seeking more power for your 650 then you have come to the right place! This English made big bore kit comes with everything you need to convert your 650 Triumph to a powerful 750. Yes bumping from a 650 to a 750 does make a BIG difference.

Included is an English made 9-bolt cylinder barrel, cast pistons, rings, wrist pins, complete top-end gasket set with push rod tube seals, and a copper head gasket. This big bore kit will work on all Triumph 650 Unit Twins (Bonneville, T120R, Tiger, TR6R. Trophy, TR6C, Etc) from 1963-1972 and Triumph 650 pre-unit twins with a 9-bolt cylinder head. Instructions are included. Please read the full listing to insure that this kit is correct for your application. 

Please note that piston ring manufacturers are subject to change depending on stock!