PISTON KIT 02-04 YZ125 56.00, WOSSNER 8072D200 YAMAHA MX

This Wossner piston kit features a 56.00mm bore and 55.94mm actual piston diameter, tailored for Yamaha YZ125 models from 2002 to 2004. With a +2.00mm oversize, this forged piston delivers robust performance, enhanced heat dissipation, and structural reliability in high-demand 2-stroke engine applications.

Features

• Forged piston construction ensures superior strength and longevity

• Facilitates optimal heat transfer from combustion chamber to cylinder walls

• Elliptical profile provides consistent bearing surface during thermal expansion

• Even distribution of thrust loads prevents localised pressure and piston collapse

• Manufactured in Germany

Specifications

• Bore: 56.00mm

• Piston Diameter: 55.94mm

• 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

• 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: RSB5600

• Rod: P2017

• Part Number: 56-W797.200.WO (Piston PN# 8072D200)