Namura Standard Bore Size B Top End Repair Kit for Yamaha WR450F 2007-2015 95mm

Namura Standard Bore Size B Top End Repair Kit for Yamaha WR450F

This top end repair kit fits Yamaha WR450F models from 2007 to 2015, using standard bore size B with a 95mm piston for a direct drop-in rebuild.

Overview

The Namura Standard Bore Size B Top End Repair Kit is a complete piston and cylinder assembly for Yamaha WR450F motorcycles made between 2007 and 2015. It uses a 95mm piston at standard size B, matching factory specifications for reliable performance. This kit is designed for owners restoring or rebuilding the top end of their WR450F without needing a rebore.

Built For Performance

• Includes 95mm piston (Size B) with rings, wrist pin, and circlips
• Precision-machined cylinder sleeve for accurate fit
• Compatible with stock Yamaha WR450F cylinder head and crankshaft
• Standard bore dimensions avoid additional machining costs
• All gaskets and seals provided for a complete installation

Fits These Machines

• for Yamaha WR450F (2007-2015)

On-The-Job Use

• Rebuilding the top end of enduro and off-road motorcycles
• Replacing worn pistons and cylinders after high-mileage use
• Restoring compression and power for competitive riding
• Maintaining factory bore size for reliable long-term operation

Specs At A Glance

Good To Know

Q: What is the difference between Size A and Size B pistons? A: Size B is slightly larger than Size A to compensate for minor cylinder wear; always measure your existing bore to confirm which size is needed.

Q: Will this kit work with a 2016 WR450F? A: No, this kit is specifically for 2007-2015 models; 2016 and later models have a different engine design.

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