Namura Standard Bore Size A Piston Kit for Yamaha YFZ450, YFZ450R & YFZ450X 95mm

Piston Kit for Yamaha YFZ450, YFZ450R & YFZ450X 95mm

This Namura Standard Bore Size A piston kit is a direct replacement piston and ring set designed to restore compression and power in Yamaha YFZ450, YFZ450R, and YFZ450X engines with a 95mm bore.

Overview

This Namura piston kit provides a high-quality OEM-spec replacement for the Yamaha YFZ450 series, using a durable cast-aluminum piston and precision ring set. It is intended for standard bore applications and includes the necessary components for a complete piston replacement. The kit is a reliable choice for restoring top-end performance.

Built For Performance

• Cast aluminum piston with reinforced skirt for durability
• Precision-machined ring grooves for consistent compression
• Includes piston rings, wrist pin, and circlips
• Standard bore size "A" ensures proper fitment without oversize machining

Fits These Machines

• for Yamaha YFZ450
• for Yamaha YFZ450R
• for Yamaha YFZ450X

On-The-Job Use

• Top-end rebuilds for ATV racing and trail riding
• Restoring lost compression in high-mileage engines
• Performance upgrades when combined with head work
• Replacement after piston seizure or ring failure

Specs At A Glance

Good To Know

Q: Does this piston kit require any machining? A: No; it is a standard bore size "A" piston that fits directly into a 95mm bore without oversizing, but you should verify your cylinder bore condition.

Q: What is the difference between size "A" and other sizes? A: Size "A" indicates the standard nominal diameter; other letters (B, C) denote slight oversizes for cylinders that have been honed or bored oversize.

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