PISTON KIT 1984 YZ125 57.50, WOSSNER 8120D150 YAMAHA MX
Wossner forged piston kit with a 57.50mm bore (57.44mm) for the 1984 Yamaha YZ125. Engineered and manufactured in Germany, it provides increased durability and optimized thermal performance. The elliptical design ensures an even bearing surface during piston expansion, effectively distributing thrust loads and minimizing the risk of piston collapse. Features forged construction for enhanced mechanical strength, engineered for efficient heat transfer to cylinder walls, and an elliptical profile for uniform load distribution under thermal expansion. Specifications include a bore size of 57.50mm (57.44mm), display volume of 123 cm³, stroke of 50.00 mm, clearance of 0.06 mm, compression height of 30.80 mm, and a 2-stroke compression ratio. Cross-reference OEM part numbers: Piston 8120D150, Lock CW16, Pin WP036, Ring Set RSB5750. Weight 212g.
- SKU
- 56-W512+150.WO
- Brand
- Wossner
- Availability
- In Stock (1)
FULL DESCRIPTION
Wossner Forged Piston Kit 57.50mm Bore
This Wossner forged piston kit features a 57.50mm bore (actual measurement 57.44mm) and is engineered for enhanced durability and optimized thermal performance. Manufactured in Germany, its innovative elliptical design ensures an even bearing surface during piston expansion, effectively distributing thrust loads and minimizing the risk of piston collapse.
Key Features:
- Forged construction for superior mechanical strength.
- Designed for efficient heat transfer to cylinder walls.
- Elliptical profile promotes uniform load distribution under thermal expansion.
- Made in Germany for quality assurance.
Specifications:
- Bore Size: 57.50mm (57.44mm)
- Stroke: 50.00 mm
- Clearance: 0.06 mm
- Compression Height: 30.80 mm
- Compression Ratio: 2-stroke (Wossner and OEM compatible)


