Namura Standard Bore Top End Rebuild Kit Size C for Yamaha YZ250F 2014-2018 77mm

Namura Standard Bore Top End Rebuild Kit Size C for Yamaha

This Namura standard bore top end rebuild kit size C is a complete replacement piston, rings, wrist pin, and gaskets for Yamaha YZ250F models from 2014 to 2018, featuring a 77mm bore to restore engine compression and performance.

Overview

This top end rebuild kit includes everything needed to refresh the cylinder assembly on your Yamaha YZ250F. Designed as a direct-fit replacement with a 77mm standard bore size, it restores compression and extends engine life for riders and mechanics. The kit is a cost-effective alternative to OEM parts, providing reliable performance for off-road and motocross use.

Built For Performance

• Includes piston, rings, wrist pin, circlips, and full gasket set
• 77mm standard bore maintains factory compression ratio
• High-strength aluminum alloy piston for durability
• Precision-ground rings ensure proper seal
• Complete set eliminates need for separate gasket orders

Fits These Machines

• for Yamaha YZ250F 2014
• for Yamaha YZ250F 2015
• for Yamaha YZ250F 2016
• for Yamaha YZ250F 2017
• for Yamaha YZ250F 2018

On-The-Job Use

• Top end rebuild for motocross racing
• Trail riding maintenance
• Engine refresh after high hours
• Competition engine preparation

Specs At A Glance

Good To Know

Q: Does this kit include a cylinder gasket? A: Yes, the kit includes a full gasket set covering head, base, and exhaust gaskets for a complete rebuild.

Q: Can I use this kit with a stock cylinder? A: Yes, the 77mm standard bore is designed for stock cylinders that are within wear limits; if the cylinder is worn, it may need reconditioning.

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