PISTON KIT 02-04 YZ125 54.00 C, WOSSNER 8072DC YAMAHA MX

This Wossner piston kit features a 54.02mm bore and 53.96mm actual piston diameter, designed for Yamaha YZ125 models from 2002 to 2004. Engineered with a +0.02mm oversize, this forged piston delivers reliable performance, enhanced heat transfer, and structural stability in high-performance 2-stroke engines.

Features

• Forged piston ensures exceptional strength and durability

• Engineered for effective heat transfer from the combustion chamber to cylinder walls

• Elliptical profile provides a consistent bearing surface during thermal expansion

• Even thrust load distribution prevents piston collapse and reduces localised stress

• Manufactured in Germany

Specifications

• Bore: 54.02mm

• Piston Diameter: 53.96mm

• 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

• 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.C.WO (Piston PN# 8072DC)