Namura Size B Standard Bore Top End Repair Kit for Yamaha YZ250 2002-2024 66.4mm

Size B Standard Bore Top End Repair Kit for Yamaha

This top end repair kit for Yamaha YZ250 provides all necessary components to restore engine performance by rebuilding the cylinder head assembly with a 66.4mm standard bore piston.

Overview

This top end repair kit for Yamaha YZ250 includes a precision-machined piston, rings, wrist pin, and circlips designed for 2002-2024 models. It is the ideal solution for restoring compression and power in your Yamaha YZ250's top end. The kit's quality ensures reliable operation and extended engine life.

Built For Performance

• Precision-machined piston from high-silicone aluminum alloy
• Chrome-plated compression ring for reduced friction
• Nitrided wrist pin for increased strength
• Includes circlips and pin bearing for complete installation
• Size B grade ensures proper fit within factory tolerances

Fits These Machines

• for Yamaha YZ250 2002-2024

On-The-Job Use

• Motocross and enduro racing requiring reliable top end performance
• Trail riding and recreational off-road use
• Engine rebuilds to restore lost compression
• Pre-season maintenance for competitive riders

Specs At A Glance

Good To Know

Q: Is this kit suitable for both Size A and Size B bores? A: No, Size B is matched specifically to standard bore cylinders within the B tolerance range; use Size A for cylinders requiring the A piston grade.

Q: Does the kit include all gaskets and seals? A: This top end repair kit includes the piston, rings, wrist pin, and circlips; base gaskets and head gaskets should be ordered separately.

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