PROX Piston Kit for Yamaha YZ426F '00-02 and WR426F '01-02 – 12.5:1 Compression Ratio

CONNECTING ROD KITS
One of our core product line, where we became famous with. Our ProX Connecting Rod Kits are made out of the toughest alloys available today and are made in Japan! O.E.M specifications and tolerances are meticulously maintained, a guarantee for easy installation and trouble free performance. Find our connecting rod dimension overview here.
ProX Rod Kit Features
Manufactured by leading Japanese OEM factories.
Designed to exact OEM specifications to be a direct and cost efficient OEM replacement.
Complete line for Dirtbike, ATV, PWC and 50cc/scooter available from stock.
Double forged on dedicated forgings
This process maintains superior strength, durability and dimensional consistency through improved grain flow.
Shot peening & barrelling
The design of a connecting rod is very important to guarantee the lifespan and the performance. Our connecting rods are barrelled and shot peened to improve the surface texture. Shot peening eliminates residual stress and smoothly blends the forging surfaces.
Oiling system
Our ProX oiling slots are precisely located to maximize lower rod oiling and extend bearing life. Even under the most extreme conditions the rod will do its job. ProX Connecting Rod Kits come complete with Crankpin, Big-End Bearing, Small End Bearing and Washers.

The PROX Piston Kit part number 01.2427.A is designed specifically for Yamaha YZ426F models from 2000 to 2002 and WR426F models from 2001 to 2002, providing reliable performance and durability. This kit includes all necessary components for a complete piston replacement, ensuring optimal engine operation and longevity. Crafted with precision, the piston features a high-quality design that maintains the engine’s power output and efficiency during demanding riding conditions. It is an ideal choice for racers and enthusiasts seeking to restore or enhance their motorcycle's performance.

Constructed with durable materials, the PROX Piston Kit offers excellent thermal stability and resistance to wear. The 12.5:1 compression ratio boosts engine power and responsiveness, making it suitable for both recreational riding and competitive racing. Easy to install with proper tools, this kit is a cost-effective way to upgrade your motorcycle’s engine components without compromising reliability. Whether rebuilding after a failure or performing routine maintenance, this piston kit provides the quality and fit you expect from PROX, a trusted brand in high-performance motorcycle parts.

Features:

• Designed for Yamaha YZ426F '00-02 and WR426F '01-02 models

• Includes all necessary components for complete piston replacement

• High-quality construction for durability and thermal stability

• Optimized for a 12.5:1 compression ratio to enhance power

• Engineered for reliable performance in demanding riding conditions