This Wossner forged piston kit with a 74.50mm nominal bore (actual 74.43mm) is engineered for ROTAX SWM250 models from 1979 to 1982. Designed for two-stroke engines, it delivers high strength and optimised thermal conductivity for demanding applications.

Features

• Forged piston construction ensures exceptional strength and durability

• Precision engineering enhances heat transfer from combustion chamber to cylinder wall

• Elliptical profile distributes load evenly, reducing localised stress and preventing piston failure

• Manufactured in Germany with strict quality standards

Specifications

• Bore Size: 74.50mm (actual 74.43mm)

• Stroke: 57.50 mm

• Clearance: 0.06 mm

• Wossner Compression Ratio: 2 stroke

• OEM Compression Ratio: 2 stroke

• Compression Height: 34.00 mm

• Lock Part Number: CW18

• Pin Part Number: WP033

• Ring Set Part Number: RSB7450 x 2

Vehicle Fitments

• ROTAX SWM250 1979–1982