PISTON KIT 86-88 YZ125 57.50, WOSSNER 8118D150 YAMAHA MX

This Wossner 57.50mm (+1.50 oversize) forged piston kit is produced in Germany. The forged process enhances durability and strength. Its elliptical shape helps maintain a consistent bearing surface during thermal expansion, reducing localised stress and evenly distributing thrust loads to prevent piston collapse. The piston also supports efficient heat transfer from the combustion chamber to the cylinder walls, ensuring reliable performance in two-stroke engines. Features include forged piston for increased structural strength and durability, elliptical design for a uniform bearing surface during heat expansion, minimised localised pressure, even distribution of thrust loads, and support for efficient combustion heat transfer to cylinder walls. Specifications: Bore 57.50mm, actual diameter 57.44mm, displacement 123 cm³, stroke 50.00mm, clearance 0.06mm, compression height 30.00mm, compression ratio 2-stroke. Cross-reference OEM Part Numbers include Piston Kit Part No. 56-W559+150.WO, Wossner Piston Kit No. 8118D150, Lock CW16, Pin WP036, and Ring Set RSB5750.