CP Pistons 01-05 Yamaha R6 13.75:1 67mm Bore x 44.5mm Stroke (627cc) Piston Kit - Set of 4

This is a set of four forged pistons from CP Pistons, specifically made for the 2001-2005 Yamaha R6. These pistons are designed to increase your engine's compression ratio to 13.75:1, using a 67mm bore and a 44.5mm stroke, bringing the total displacement to 627cc. This kind of modification is typically done when rebuilding or significantly upgrading the engine for more power.

CP Pistons are well-known in performance circles for their robust construction. These are forged pistons, meaning they start as a solid block of aluminum that's heated and hammered into shape under immense pressure. This process creates a much stronger and more durable piston than cast aluminum, which is crucial for handling the increased cylinder pressures and temperatures that come with a higher compression ratio. The 13.75:1 compression ratio means the air-fuel mixture is squeezed more before ignition, leading to a more powerful combustion event and a noticeable increase in horsepower and torque. This kit includes everything needed to replace all four pistons in your R6 engine.

When installing these pistons, it's important to ensure your engine's fuel and ignition systems are properly tuned to take advantage of the increased compression. You'll also want to make sure your cylinder head and block surfaces are perfectly flat for a good seal. Because these are a performance upgrade, it's recommended to consult with a professional engine builder or refer to detailed service manuals for the correct installation procedures and clearances. Please note that this kit is not CARB approved and cannot be shipped to California.