Namura Standard Bore Top End Repair Kit Size C for Yamaha YZ450FX 2024-2025 97mm

Namura Standard Bore Top End Repair Kit Size C for Yamaha

This top end repair kit for the 2024-2025 Yamaha YZ450FX includes a piston, rings, gasket set, and wrist pin to restore cylinder performance at 97mm bore.

Overview

The Namura Standard Bore Top End Repair Kit Size C is a complete rebuild solution for the Yamaha YZ450FX, combining a cast piston, rings, gaskets, and wrist pin for a reliable cylinder refresh. Designed for the 97mm bore, this kit replaces worn components to restore compression and power. It suits riders rebuilding their top end after hours of aggressive trail or track use.

Built For Performance

• Cast piston with precise skirt profile for reduced friction and quick break-in
• Premium ring set provides consistent cylinder seal and oil control
• Reinforced wrist pin and clips handle high-rpm loads without failure
• Complete gasket set matches OEM sealing requirements for leak-free assembly
• Bore-specific 97mm sizing ensures proper fitment in the factory cylinder

Fits These Machines

• for Yamaha YZ450FX 2024-2025

On-The-Job Use

• Trail riding and enduro competition where reliable top end performance is critical
• Motocross track days requiring a fresh cylinder after extended use
• Off-season engine rebuild to maintain peak power and reliability
• Replacing worn pistons after piston slap or blow-by is detected

Specs At A Glance

Good To Know

Q: Can I reuse the old head gasket with this kit? A: No, the included gasket set must be used to ensure proper sealing and prevent leaks after installation.

Q: Does this kit include the cylinder or only the top end parts? A: This is a top end repair kit containing piston, rings, gaskets, and wrist pin; the cylinder is not included and must be inspected separately.

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