Wossner 78.50mm (78.42mm) forged piston kit is designed for Maico 400 models from 1973 to 1981. Engineered for strength and precision, this piston ensures efficient heat transfer to the cylinder walls, providing uniform expansion and reducing localized pressure. The elliptical design distributes thrust loads evenly, preventing piston collapse. Manufactured in Germany, it meets high-quality standards for reliable performance.

Features

• Wossner forged piston for superior strength and durability


• Optimized heat transfer for improved combustion efficiency


• Elliptical design for uniform bearing surface and reduced localized pressure


• Precision-engineered to prevent piston collapse


• Made in Germany

Specifications

• Bore Size: 78.50mm (78.42mm)


• Oversize: +1.50mm


• Displacement: 386cc


• Stroke: 83.00mm


• Clearance: 0.08mm


• Compression Ratio: 2-stroke


• Compression Height: 41.70mm


• Lock Part Number: CW18


• Pin Part Number: WP039


• Ring Set Part Number: RSC7850


• Theoretical Weight: Not specified

Vehicle Fitments

• Maico 400 (1973-1981)