Wossner WO-4095-DB Forged Piston Kit Yamaha WR250F, YZ250F and YZ250FX
Wossner WO-4095-DB Yamaha WR250F, YZ250F & YZ250FX Forged Piston Kit – 14.4:1 Compression
The Wossner WO-4095-DB Forged Piston Kit is a precision Grade B piston engineered for selected Yamaha WR250F, YZ250F and YZ250FX four-stroke motorcycles. Manufactured from premium forged aluminium and precision CNC machined, this Pro Series piston delivers excellent strength, dimensional stability and dependable performance in demanding motocross, enduro and cross-country applications.
Featuring a 77.01 mm graded bore, 76.97 mm piston diameter and a 14.4:1 Wossner compression ratio, the WO-4095-DB is designed for cylinders requiring the Grade B piston size. Its specialised design is intended for use with a 2 mm longer connecting rod and incorporates 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 Grade B forged piston
- 77.01 mm graded bore
- 76.97 mm piston diameter
- 0.01 mm oversize grade
- 0.04 mm recommended piston-to-cylinder clearance
- 53.60 mm stroke
- 18.00 mm compression height
- 249.66 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. The cylinder must be accurately measured to confirm that the Grade B piston provides the specified clearance. Always confirm the motorcycle make, model and year before installation. 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.