Namura Size A Standard Bore 66.35mm Piston Kit for Yamaha YZ250 1999-2024 66.4mm

Size A Standard Bore 66.35mm Piston Kit for Yamaha

This piston kit for Yamaha YZ250 is designed for standard bore applications with a 66.35mm piston diameter, intended for a 66.4mm cylinder bore. It fits YZ250 models from 1999 to 2024, providing a direct replacement for worn pistons.

Overview

This piston kit for Yamaha YZ250 includes a precision-ground piston, rings, wrist pin, and circlips for a complete top end refresh. Ideal for YZ250 owners needing a standard bore piston, this kit restores compression and performance. Use this piston kit to maintain your YZ250's engine reliability.

Built For Performance

• Precision-machined 66.35mm piston for tight fit
• High-quality piston rings reduce blow-by
• Hardened wrist pin for durability
• Includes circlips for secure pin retention
• Manufactured to OEM specifications for reliable performance

Fits These Machines

• for Yamaha YZ250 (1999-2024)

On-The-Job Use

• Motocross engine rebuilds
• Trail riding piston replacement
• Enduro competition maintenance
• General dirt bike top end service

Specs At A Glance

Good To Know

Q: Will this piston kit fit a 2003 YZ250? A: Yes, it fits YZ250 models from 1999 to 2024, including the 2003 model year, provided the cylinder bore is standard 66.4mm.

Q: Does the kit include wrist pin bearings? A: The kit includes the wrist pin and circlips, but wrist pin bearings are typically reused or purchased separately if needed.

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