Namura Standard Bore Piston Kit Size B 94.96mm for Yamaha WR450F 2003-2015 95mm

Standard Bore Piston Kit for Yamaha WR450F

This standard bore piston kit from Namura measures 94.96mm (size B) and is designed to fit Yamaha WR450F models from 2003 to 2015, providing a direct replacement for worn pistons.

Overview

The Namura standard bore piston kit delivers a reliable replacement for Yamaha WR450F engines from 2003 to 2015. With a 94.96mm bore diameter, this size B piston restores compression and performance. It is an excellent choice for off-road riders and mechanics performing top-end rebuilds.

Built For Performance

• Cast from high-silicon aluminum alloy for thermal stability
• Precision-machined ring grooves for optimal seal
• Includes piston rings, wrist pin, and circlips
• Weight-matched for balanced engine operation
• Designed to match stock bore specifications

Fits These Machines

• for Yamaha WR450F (2003-2015)

On-The-Job Use

• Top-end engine rebuilds on Yamaha WR450F dirt bikes
• Replacing worn or scored pistons to restore compression
• Maintenance for off-road racing and trail riding
• General engine overhaul for Yamaha four-stroke singles

Specs At A Glance

Good To Know

Q: Is the piston pre-assembled with rings? A: The kit includes the piston, rings, wrist pin, and circlips, but rings must be installed following the manufacturer's instructions.

Q: Will this work with a modified WR450F cylinder? A: It is intended for standard bore cylinders; aftermarket cylinders may require oversized pistons.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.