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)