WOSSNER 77mm PISTON KIT B, YAMAHA YZ250F 14-15, WR250F 15-17, YZ250FX 15-16

This Wossner forged piston kit, part number 8893DB, features a 77.01mm bore with an actual piston size of 76.96mm (+0.01mm oversize). Designed for Yamaha YZF250 models from 2014 to 2015, this high-compression piston is manufactured in Germany and engineered for enhanced durability, efficient heat transfer, and optimal performance. Its elliptical profile ensures uniform expansion and balanced thrust loads during operation.

Features

• Forged construction for strength and high durability
• High compression design for improved performance
• Elliptical shape supports even expansion and load distribution
• Designed for efficient heat transfer from combustion chamber
• Made in Germany
• Direct OEM replacement
• Easy to install; professional installation recommended if unsure

Specifications

• Bore Size: 77.01mm
• Actual Piston Size: 76.96mm
• 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)

Majority of our listings are for a direct replacement for your original part.

Our parts are made of quality and are designed to meet or exceed the original OEM Standards.

Our products are often a cost effective alternative to genuine OEM Parts.

Please note: the models of bike we state in our listings are for general guidance only. Please make sure this item will fit your bike before purchasing. Also, we cannot guarantee fitment to any non-UK models.