PISTON KIT 86-88 YZ125 56.75, WOSSNER 8118D075 YAMAHA MX

This Wossner 56.75mm (+0.75 oversize) forged piston kit is designed for Yamaha YZ125 models. Featuring a forged build and elliptical design, the piston is engineered for thermal expansion control, even thrust load distribution, and reliable performance in two-stroke engines. Manufactured in Germany, it ensures efficient heat transfer from the combustion chamber to the cylinder walls under demanding conditions. Features include forged piston construction for enhanced strength and durability, an elliptical design providing a consistent bearing surface under thermal expansion, and even distribution of thrust loads that minimises localised stress and prevents piston collapse. Specifications include a bore of 56.75mm, actual diameter of 56.69mm, displacement of 123 cm³, stroke of 50.00mm, clearance of 0.06mm, compression height of 30.00mm, and a compression ratio of 2-stroke. Cross-reference OEM part numbers include Piston Kit Part No.: 56-W559+075.WO, Wossner Piston Kit No.: 8118D075, Lock: CW16, Pin: WP036, and Ring Set: RSB5675.