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)