Namura Standard Bore Cylinder Piston Gasket Kit for Yamaha YZ125 2005-2021 54mm

Namura Standard Bore Cylinder Piston Gasket Kit for Yamaha YZ125

This kit includes a 54mm standard bore cylinder piston assembly and all necessary gaskets for rebuilding the top end of Yamaha YZ125 models from 2005 to 2021.

Overview

The Namura standard bore cylinder piston gasket kit provides everything needed to restore compression and performance in a Yamaha YZ125. This 54mm bore kit includes a cast piston, rings, and full gasket set for a complete top-end overhaul. Designed for 2005-2021 YZ125 models, it is a reliable choice for maintaining engine power and reliability.

Built For Performance

• Cast aluminum piston with precision-machined ring grooves for consistent sealing
• Includes cylinder base gasket, head gasket, and exhaust gasket
• Standard bore dimensions match OEM specifications for easy installation
• Piston rings pre-gapped for quick assembly
• Durable construction withstands high-rpm operation

Fits These Machines

• for Yamaha YZ125 (2005-2021)

On-The-Job Use

• Motocross racing on tracks requiring frequent top-end rebuilds
• Off‑road trail riding where reliable engine performance is essential
• Enduro and hare scramble events demanding durable components
• Recreational riding and practice sessions for consistent engine output

Specs At A Glance

Good To Know

Q: Do I need to hone the cylinder before installation? A: Yes, always inspect and hone the cylinder to match the new piston and rings for proper break-in.

Q: Are the gaskets included compatible with OEM specifications? A: Yes, they are designed to meet OEM dimensions for a precise seal.

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