This Wossner forged piston kit, part number 8893DC, features a 77.02mm bore with an actual piston size of 76.98mm (+0.02mm oversize). Designed for TM MX-F450 (2009–2010), MX-Fi450 (2011), and EN-Fi450 (2011), this German-made piston is engineered for performance with high strength, efficient heat transfer, and balanced load distribution through its elliptical profile, offering a compression increase over OEM specifications.

Features

• Forged construction for strength and durability in performance applications


• Elliptical design supports even thermal expansion and thrust load distribution


• Optimized for efficient 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: 76.98mm


• 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


• CW16 (Lock)


• WP087 (Pin)


• 770XAS-2 (Ring Set)

Vehicle Fitments

• TM MX-F450 (2009–2010)


• TM MX-Fi450 (2011)


• TM EN-Fi450 (2011)