Namura Standard Bore Piston Kit Size B 76.97mm for Yamaha WR250F 2015-2019 77mm

Standard Bore Piston Kit Size B 76.97mm for Yamaha

This piston kit is a replacement for Yamaha WR250F models from 2015 to 2019, sized at 76.97mm (size B) with an OEM cross-reference of 77mm.

Overview

This Namura piston kit is designed for standard bore replacement in Yamaha WR250F engines, offering a 76.97mm diameter size B for precise fit and reliable compression. It is suitable for riders and mechanics looking to restore top-end performance on their WR250F dirt bike, ensuring consistent power output and engine longevity.

Built For Performance

• Forged aluminum alloy construction for high strength and thermal stability
• Machined to exact size B specifications (76.97mm) for proper clearance
• Includes piston rings, wrist pin, and circlips for a complete rebuild kit
• Lightweight design reduces inertia for improved throttle response
• Engineered to OEM tolerances for reliable sealing and minimal friction

Fits These Machines

• for Yamaha WR250F 2015-2019

Specs At A Glance

Good To Know

Q: Does this kit include a piston pin and clips? A: Yes, the kit comes complete with the piston, rings, wrist pin, and circlips for installation.

Q: Can this piston be used with the stock cylinder? A: It is designed for standard bore size B (76.97mm) and should be used with a cylinder that matches that specification.

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