Triumph 650 To 750 Twin Big Bore Kit - 1963-72 - 6T / TR6 / T120 Nicholson 70-4501 or E4501

70-4501 or E4501

they are not perfect and may require additional polishing

making sure your cam bushings are inline after you install them is an animal of a different color

With this Rubber Boot

Triumph 650 To 750 Twin Big Bore Kit - 1963-72 - 6T / TR6 / T120 Nicholson 70-4501 or E4501English 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