Restore dependable top-end performance with the Namura FX-40032K Forged Top-End Kit. Designed for select Yamaha four-stroke off-road motorcycles, this standard-bore kit includes the major components needed for a complete top-end refresh. The forged piston is engineered for strength and durability under demanding riding conditions, while the included rings, wrist pin, clips, top-end bearing, and gasket kit help simplify installation.
The Namura FX-40032K features an 11:1 compression ratio and is designed to fit 2001–2004 Yamaha YZ250F models and 2001–2004 Yamaha WR250F models. It is a suitable replacement solution for worn or damaged original top-end components and can help restore compression, throttle response, and overall engine performance when installed with properly inspected mating components. Verify the motorcycle year and model before ordering to ensure correct fitment.
Manufacturer: Namura. Vendor Part Number: FX-40032K. This kit is supplied as a complete top-end package for the listed Yamaha applications and is intended for use by qualified technicians following the applicable service manual procedures. Inspect the cylinder, connecting rod, crankshaft, and related engine components before assembly, and use the specified clearances, torque values, and break-in procedures for the motorcycle.
Features:
- Complete top-end kit includes forged piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- Standard-bore piston design with an 11:1 compression ratio
- Fits 2001–2004 Yamaha YZ250F models
- Fits 2001–2004 Yamaha WR250F models
- Brand: Namura; Manufacturer and Vendor Part Number: FX-40032K
Fitment:
2001 Yamaha WR250F
2001 Yamaha YZ250F
2002 Yamaha WR250F
2002 Yamaha YZ250F
2003 Yamaha WR250F
2003 Yamaha YZ250F
2004 Yamaha WR250F
2004 Yamaha YZ250F