PISTON KIT 02-04 YZ125 54.00 A, WOSSNER 8072DA YAMAHA MX 5NY-11631-01-D0

This Wossner piston kit features a 54.00mm bore and 53.94mm actual piston diameter, designed for Yamaha YZ125 models from 2002 to 2004. Built with forged construction, it delivers strength, optimal heat transfer, and consistent performance for 2-stroke engines under demanding conditions.

Features

• Forged piston construction enhances durability and structural integrity

• Promotes efficient heat transfer from the combustion chamber to the cylinder walls

• Elliptical design ensures uniform bearing surface under thermal expansion

• Distributes thrust loads evenly to reduce localised pressure and prevent piston collapse

• Manufactured in Germany

Specifications

• Bore: 54.00mm

• Piston Diameter: 53.94mm

• Display (cm³): 125

• Stroke (mm): 54.50

• Clearance (mm): 0.06

• Compression Height (mm): 28.00

• Wossner Compression Ratio: 2-stroke

• OEM Compression Ratio: 2-stroke

Cross-Reference OEM Part Numbers

• 5NY-11631-01-D0

• 5NY-11631-01-C0

• 5NY-11631-01-B0

• 5NY-11631-01-A0

• 797M05400

• 09104787

• Ring: 5NY-11611-00-00

• Pin: 5UN-11633-00-00

• Circlip: 93450-16068-00

Vehicle Fitments

• Yamaha YZ125 2002–2004

Included Components

• Lock: CW15

• Pin: WP032

• Ring Set: RSB5400

• Rod: P2017

• Part Number: 56-W797.A.WO (Piston PN# 8072DA)