PISTON KIT 2014 YZF250 77.0 HC, FORGED WOSSNER 8894DA, 1SM-11631-01-00

This Wossner forged piston kit, part number 8893DA, features a standard 77.00mm bore with an actual piston size of 76.95mm. It is designed for Yamaha YZF250 models from 2014 to 2015. Manufactured in Germany, this high-compression piston is built for performance, providing increased compression over OEM specifications. Its elliptical design ensures even load distribution and optimal thermal expansion resistance.

Features

• Forged construction for superior strength and durability
• High compression design for increased engine performance
• Elliptical profile for uniform expansion and balanced thrust load distribution
• Optimized for combustion heat transfer
• Made in Germany
• Direct OEM replacement
• Easy to install; professional installation recommended if unsure

Specifications

• Bore Size: 77.00mm
• Actual Piston Size: 76.95mm
• Displacement: 249cm³
• Stroke: 53.60mm
• Clearance: 0.05mm
• Dome Volume: -3.00cm³
• Wossner Compression Ratio: 13.70:1
• OEM Compression Ratio: 13.50:1
• Compression Height: 20.20mm

Cross-Reference OEM Part Numbers

• 1SM-11631-01-00
• CW16 (Lock)
• WP087 (Pin)
• 770XAS-2 (Ring Set)

Vehicle Fitments

• YZF250 (2014–2015)