Wossner WO-4095-DA Forged Piston Kit Yamaha WR250F, YZ250F and YZ250FX
Wossner WO-4095-DA Yamaha WR250F, YZ250F & YZ250FX Forged Piston Kit – 14.4:1 Compression
The Wossner WO-4095-DA Forged Piston Kit is engineered for selected Yamaha WR250F, YZ250F and YZ250FX four-stroke motorcycles. Manufactured from premium forged aluminium and precision CNC machined, this Pro Series piston provides exceptional strength, stability and durability for demanding motocross, enduro and cross-country applications.
Featuring a 77.00 mm standard bore, 76.96 mm piston diameter and a 14.4:1 Wossner compression ratio, the WO-4095-DA is designed to increase compression compared with the original 13.8:1 specification. Its specialised design is intended for use with a 2 mm longer connecting rod and features a 3D crown, double-bridge forging and two-ring construction.
- Suitable for Yamaha WR 250 F 2020–2025
- Suitable for Yamaha YZ 250 F 2019–2025
- Suitable for Yamaha YZ 250 FX 2020–2025
- Pro Series forged piston
- 77.00 mm standard bore
- 76.96 mm piston diameter
- 0.04 mm recommended piston-to-cylinder clearance
- 53.60 mm stroke
- 18.00 mm compression height
- 249.60 cc displacement
- 13.8:1 original compression ratio
- 14.4:1 Wossner compression ratio
- Designed for a 2 mm longer connecting rod
- 94.50 mm connecting rod length
- Compatible connecting rod: P4080, P4080-RPB or P4080-RPL
- Pro Series 3D piston crown
- Double-bridge forged construction
- Two-ring piston design
- Ring set: 1SM-11603-00-00
- WP070DLC wrist pin
- 16 mm wrist pin diameter
- CW16 retaining clips
- Top-end gasket reference: C3695
- Includes piston, piston rings, wrist pin and retaining clips
Important: This piston features a specialised 2 mm long-rod design and must be used with the correct connecting rod and engine combination. Always confirm the motorcycle make, model, year, connecting rod configuration and measured cylinder bore before ordering. Professional engine assembly is recommended.
Notice: Product images may differ from the actual product. Images are provided for illustration purposes only and may show a representative item rather than the exact part supplied.