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

This Wossner forged piston kit, part number 8893DC, features a 77.02mm bore with an actual piston size of 76.97mm (+0.02mm oversize). Designed for Yamaha YZF250 models from 2014 to 2015, it is a high-compression piston made in Germany. Its elliptical design enhances strength, distributes load evenly, and supports optimal heat transfer for high-performance four-stroke engines.

Features

• Forged piston construction for high strength and reliability
• High compression design for increased performance
• Elliptical profile for balanced expansion and load distribution
• Engineered for effective combustion heat transfer
• Made in Germany
• Direct OEM replacement
• Easy to install; professional installation recommended if unsure

Specifications

• Bore Size: 77.02mm
• Actual Piston Size: 76.97mm
• 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.