WOSSNER 56.5mm PISTON KIT YAMAHA YZ125 1983 & 1985

This Wossner piston kit features a 56.50mm bore (+0.01 oversize) and is designed for Yamaha YZ125 models from 1983 and 1985. Wossner forged pistons are engineered to offer superior strength and efficient heat transfer from the combustion chamber to the cylinder walls. The elliptical design ensures a uniform bearing surface under heat expansion, distributing thrust loads evenly to prevent piston collapse. Manufactured in Germany.

Features

• Forged construction for increased strength
• Optimized heat transfer to cylinder walls
• Elliptical design for uniform bearing surface and thrust load distribution
• Made in Germany

Specifications

• Bore Size: 56.50mm
• Bore (Actual Measured): 56.44mm
• Display Volume: 83 cm³
• Stroke: 84.00mm
• Clearance: 0.06mm
• Compression Ratio (Wossner): 2-stroke
• Compression Ratio (OEM): 2-stroke
• Compression Height: 30.80mm
• Lock Part Number: CW16
• Pin Part Number: WP036
• Ring Set Part Number: RSB5600

Cross-Reference OEM Part Numbers

• 39W-11-630-00-00
• 55Y-11631-00-94

Vehicle Fitments

• Yamaha YZ125 1983
• Yamaha YZ125 1985

Majority of our listings are for a direct replacement for your original part.

Our parts are made of quality and are designed to meet or exceed the original OEM Standards.

Our products are often a cost effective alternative to genuine OEM Parts.

Please note: the models of bike we state in our listings are for general guidance only. Please make sure this item will fit your bike before purchasing. Also, we cannot guarantee fitment to any non-UK models.