1963-1972 TRIUMPH 650 TO 750 C.C. BIG BORE KIT

TRIUMPH BIG BORE KIT | The 1963-1972 Triumph 650 to 750 cc big bore kit is a performance upgrade for Triumph motorcycles, primarily models with 650cc engines, like the Triumph Bonneville and Triumph TR6. This kit was popular among enthusiasts looking to increase displacement and improve performance without completely replacing the engine. Here’s an overview:

Purpose:

• Increase engine displacement: The stock 650cc engine is bored out to 750cc, allowing more fuel and air into the engine, which increases power output and torque.
• Enhanced performance: The bigger displacement provides better acceleration and higher top speeds, making the motorcycle more suitable for modern roads or racing applications.

Components | Buy Triumph BIG Bore Kit Online

A typical big bore kit includes:

• Larger pistons: Usually oversized, lightweight pistons made of forged aluminum for durability and improved performance.
• Cylinder sleeves or re-boring: The existing cylinders are re-bored to accommodate the larger pistons, or sometimes new sleeves are provided for the larger displacement.
• Rings, gaskets, and pins: New piston rings, gaskets, and wrist pins are included to ensure proper sealing and fitment with the new components.
• Cylinder head modification (optional): Some kits may recommend or include head work (larger valves, porting) to complement the increased displacement.

Installation Considerations | Buy Triumph BIG Bore Kit Online

• Machining required: The stock cylinder bores typically need to be machined to accommodate the larger pistons. This requires precision work.
• Compression ratio: Depending on the pistons used, compression ratios can change, affecting performance and the need for higher-octane fuel.
• Carburetion and tuning: After installation, carburetors may need to be re-jetted, and the ignition system may need adjustments to optimize the performance of the bigger engine.

Models Compatible:

This kit is compatible with Triumph 650cc twins from 1963-1972, including:

• Triumph Bonneville T120
• Triumph TR6 Trophy
• Triumph Tiger 110 (post-unit models)

• 650c.C. To 750c.C. Big Bore Conversion Kit
• No Machining Required
• 9:1 Compression Pistons
• Gasket Kit Included
• Made In England

The ever popular Triumph big bore kit, increase your displacement and power! This kit includes everything you need to install, this kit is bolt-on: no machining required! Fits unit 650 Triumph 1963 – 1972.  Included is a 750 c.c. barrel, pistons, rings, wrist pins, copper head gasket, and gasket kit. The pistons that come with this kit have a compression ratio of 9:1.