Namura Standard Bore Piston Kit Size A for Yamaha YZ250F & WR250F 2005-2013 77mm

Standard Bore Piston Kit Size A for Yamaha YZ250F & WR250F 2005-2013 77mm

This standard bore piston kit, size A, is a replacement part from Namura designed for Yamaha YZ250F and WR250F models from 2005 to 2013 with a 77mm bore, providing durable performance and easy installation.

Overview

The standard bore piston kit size A (77mm) from Namura is a high-quality replacement for Yamaha YZ250F and WR250F motorcycles made between 2005 and 2013, offering reliable compression and smooth operation. It serves as a direct fit for these popular off-road and dual-sport models. This standard bore piston kit delivers consistent power for both recreational and competitive riders.

Built For Performance

• Precision-machined from premium aluminum alloy for strength and lightweight performance
• Includes rings and wrist pin for a complete piston replacement
• Direct replacement design for simple installation without modifications
• Matches OEM specifications for bore size and clearance
• Size A ensures proper fit within factory tolerance ranges

Fits These Machines

• for Yamaha YZ250F (2005-2013)
• for Yamaha WR250F (2005-2013)

On-The-Job Use

• Ideal for rebuilding top ends on Yamaha YZ250F motocross bikes
• Suitable for restoring compression on Yamaha WR250F enduro models
• Commonly used during full engine overhaul or performance restoration
• Works for both track riding and trail riding applications

Specs At A Glance

Good To Know

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

Q: Can this standard bore piston be used with a cylinder that has been reconditioned? A: Yes, as long as the cylinder is within factory specifications for a 77mm standard bore, this piston can be used with a properly honed or reconditioned cylinder.

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