This Wossner forged piston kit, part number 8820DB, features a 95.01mm bore with an actual piston size of 94.97mm (+0.02mm oversize). It is engineered for TM MX-F450 (2009–2010), MX-Fi450 (2011), and EN-Fi450 (2011) models. Made in Germany, this high-performance four-stroke piston is designed for durability, efficient heat transfer, and even pressure distribution, using an elliptical profile to reduce localized stress.

Features

• Forged construction for strength and performance durability


• Elliptical profile for even expansion and thrust load distribution


• Designed for optimal combustion heat dissipation


• Made in Germany


• Direct OEM replacement


• Easy to install; professional installation recommended if unsure

Specifications

• Bore Size: 95.01mm


• Actual Piston Size: 94.97mm


• Displacement: 250cm³


• Stroke: 63.40mm


• Clearance: 0.04mm


• Dome Volume: -6.40cm³


• Compression Ratio: 13.00:1 (OEM)


• Compression Height: 21.00mm

Cross-Reference OEM Part Numbers

• CW19 (Lock)


• WP037 (Pin)


• 950ADS-2 (Ring Set)

Vehicle Fitments

• TM MX-F450 (2009–2010)


• TM MX-Fi450 (2011)


• TM EN-Fi450 (2011)