Namura Standard Bore Piston Kit Size B for Yamaha YZ250F & WR250F 2001-2004 77mm

Namura Standard Bore Piston Kit Size B for Yamaha

This aftermarket piston kit is a direct replacement for the original piston assembly in 2001-2004 Yamaha YZ250F and WR250F engines with a 77mm bore, restoring compression and performance.

Overview

The Namura Standard Bore Piston Kit Size B is a high-quality replacement piston kit designed for 2001-2004 Yamaha YZ250F and WR250F motorcycles. This 77mm piston kit features precise manufacturing to ensure a proper fit and reliable operation, making it an ideal choice for rebuilding your top end. Riders trust this piston kit for its durability and consistent performance in off-road and motocross applications.

Built For Performance

• Standard bore size B with 77mm diameter for precise cylinder fitment
• High-strength aluminum alloy construction for lightweight strength
• Includes piston rings and wrist pin for a complete top-end rebuild
• Manufactured to OEM specifications for seamless installation
• Designed to withstand high RPM and heat loads common in four-stroke dirt bike engines

Fits These Machines

• for Yamaha YZ250F 2001-2004
• for Yamaha WR250F 2001-2004

On-The-Job Use

• Restoring top-end compression in a worn YZ250F engine
• Rebuilding a WR250F after high-hour trail riding
• Replacing OEM piston during a full engine rebuild for motocross
• Preparing a 2003 YZ250F for competitive racing season

Specs At A Glance

Good To Know

Q:Will this piston kit fit a 2002 Yamaha YZ250F?A:Yes, the Namura Standard Bore Piston Kit Size B is designed for 2001-2004 YZ250F and WR250F models; confirm your cylinder bore is 77mm.

Q:Does the kit include everything needed for installation?A:Yes, it comes with the piston, rings, and wrist pin, though you may need new gaskets and circlips separately.

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