PISTON 99-09 TM250 66.4 DOME, WOSSNER 8137DA FORGED KIT, SINGLE RING

Wossner forged piston kit designed for superior strength and performance in 2-stroke engines. Engineered for optimal heat transfer from the combustion chamber to cylinder walls. The elliptical design ensures uniform bearing surface under heat expansion, reducing localized pressure and distributing thrust loads evenly to prevent piston collapse. Manufactured in Germany.

Features

• Forged construction for enhanced durability
• Optimized heat transfer for improved performance
• Elliptical design prevents localized pressure and piston collapse
• Domed piston design for increased efficiency
• Single-ring configuration for reduced friction and improved performance

Specifications

• Bore: 66.33 mm
• Piston Size: 66.40 mm
• Displacement: 249 cm³
• Stroke: 72.00 mm
• Clearance: 0.07 mm
• Wossner Compression Ratio: 2-stroke
• OEM Compression Ratio: 2-stroke
• Dome Volume: Domed
• Compression Height: 38.00 mm

Cross-Reference OEM Part Numbers

• Lock: CW18
• Pin: WP033
• Ring Set: RSB6640 x2

Vehicle Fitments

• TM 250 Cross (1999-)
• TM 250 Enduro (1999-)