Namura Standard Bore Size C Top End Repair Kit for Yamaha YZ65 2018-2024 43.5mm

Namura Standard Bore Size C Top End Repair Kit for Yamaha

This top end repair kit is a complete cylinder re‑build package for the Yamaha YZ65, providing a standard bore piston, rings, pin, and clips for a fresh engine top end.

Overview

The Namura Standard Bore Size C top end repair kit is engineered for the Yamaha YZ65 from 2018 through 2024, delivering a precise 43.5mm piston assembly to restore compression and power. This kit replaces the OEM top end components with a reliable aftermarket solution.

Built For Performance

• Cast from high‑strength aluminum‑silicon alloy for durability
• Standard bore size C specification matches OEM dimensions exactly
• Includes a matched ring set for consistent ring seal
• Wrist pin and circlips are included for a complete installation
• Lightweight design reduces reciprocating mass

Fits These Machines

• for Yamaha YZ65 (2018‑2024)

On‑The‑Job Use

• Motocross and off‑road racing on two‑stroke dirt bikes
• Replacing a worn or damaged top end during routine engine maintenance
• Restoring compression and power in a high‑hour Yamaha YZ65

Specs At A Glance

Good To Know

Q: Is this a complete top end kit with cylinder and gaskets? A: No, this kit includes only the piston, rings, wrist pin, and clips; you will need to purchase the cylinder, gaskets, and other components separately.

Q: Can I use this kit for a YZ65 with a modified cylinder? A: This is a standard bore size C piston; it is intended for a cylinder that has not been bored oversized. If your cylinder has been modified, you must match the piston to the actual bore size.

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