70-6304BB Triumph 650 to 750 Big Bore Kit

This is a 1963 -1972 Triumph Unit 650 to 750 CC Big Bore Kit. These will fit a 1950-62 Pre Unit engine  with the use of a later model 9 bolt Cylinder head (1963 and later). This Kit is set up not to use the factory Oiling system for the exhaust lifters. Many big bore kits didn’t ever use them. We can provide a plug for the hole on the engine case if requested.

English made 9-bolt cylinder barrel, cast pistons and rings by Goetze (9:1 ratio), wrist pins, complete Top-end gasket set, and a copper head gasket.

Fits 1963-1972 with a 9-bolt cylinder head.

This big bore kit will work on all Triumph 650 Unit Twins (Bonneville, T120R, Tiger, TR6R. Trophy, TR6C)

Instructions included.