ProX High-Compression "B" Piston Kit 01.2441.B

ProX High-Compression "B" Piston Kit (Part # 01.2441.B)

Boost response and top-end performance on your 4-stroke with the ProX High-Compression Piston Kit. Engineered as a direct performance upgrade over the stock setup, this kit increases the factory compression ratio to 13.5:1 to maximize horsepower and throttle response throughout the powerband.

This "B" size piston (96.96mm) is designed for standard-bore plated cylinders, offering slightly increased tolerance over the "A" size to restore ideal piston-to-wall clearances on slightly worn cylinders without requiring re-plating or re-boring.

Key Features:

• High-Compression Upgrade: Bumps compression to 13.5:1 for sharper throttle response and increased overall power output.

• Complete Overhaul Kit: Includes high-compression piston, premium ring set, wrist pin, and circlips.

• Precision CNC Machining: Manufactured in Japan from low-expansion, low-friction alloys designed to handle high RPM and heavy loads.

• Direct Drop-In Fit: Designed for standard-bore cylinders and fully compatible with OEM valvetrain and head components.

Specifications:

• Bore Size: 96.96mm (Standard Size "B")

• Compression Ratio: 13.5:1

• Part Number: 01.2441.B

Fitment

Yamaha YZ450F (2010 – 2013)