This Wossner forged piston kit, part number 8893DA, features a standard 77mm bore with an actual piston size of 76.96mm. It is engineered for TM MX-F450 (2009–2010), MX-Fi450 (2011), and EN-Fi450 (2011) models. Manufactured in Germany, the piston is designed for high-performance four-stroke applications, offering superior heat transfer, strength, and pressure distribution due to its elliptical profile.

Features

• Forged construction for strength and long-lasting durability


• Elliptical design for uniform expansion and thrust load balance


• Optimized for heat transfer in high-performance engines


• Made in Germany


• Direct OEM replacement


• Easy to install; professional installation recommended if unsure

Specifications

• Bore Size: 77.00mm


• 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

• 40116M07700


• 1SM-11631-01-00


• CW16 (Lock)


• WP087 (Pin)


• 770XAS-2 (Ring Set)

Vehicle Fitments

• TM MX-F450 (2009–2010)


• TM MX-Fi450 (2011)


• TM EN-Fi450 (2011)