Namura Standard Bore Size B Top End Repair Kit for Yamaha YZ450FX 2016-2020 97mm

Standard Bore Size B Top End Repair Kit for Yamaha

This top end repair kit is engineered for Yamaha YZ450FX models from 2016 to 2020, featuring a 97mm bore with B piston grade.

Overview

This complete top end repair kit includes a piston, rings, pin, circlips, and gaskets to restore compression and power. Designed for off-road enthusiasts, it provides all necessary components for a top end rebuild.

Built For Performance

• Precision-machined piston from high-strength aluminum alloy
• Matched piston rings for optimal sealing
• Includes wrist pin and circlips for secure installation
• Complete gasket set for leak-free assembly
• B piston grade ensures proper cylinder clearance

Fits These Machines

• for Yamaha YZ450FX (2016-2020)

On-The-Job Use

• Rebuilding the top end after extended use
• Restoring lost compression and engine power
• Preparing the engine for racing season
• Replacing worn piston and rings during maintenance

Specs At A Glance

Good To Know

Q: How do I verify this kit fits my engine? A: Confirm your Yamaha YZ450FX model year and check the existing piston grade (A, B, or C) stamped on the piston dome.

Q: Is a break-in procedure necessary? A: Yes, follow a proper break-in cycle with varying throttle loads for the first hour to seat the rings.

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