PISTON KIT 98-01 YZ125 55.00, WOSSNER 8091D100 YAMAHA MX

This Wossner piston kit with a 55.00mm bore (+1.00mm oversize) is designed for Yamaha YZ125 and WR125 models from 1998 to 2001. Manufactured in Germany, the forged piston ensures strength, uniform heat expansion, and reliable performance under two-stroke engine conditions.

Features

• Forged piston construction enhances strength and durability

• Efficient heat transfer from combustion chamber to cylinder wall

• Elliptical design ensures even pressure distribution and minimises piston distortion

• Produced in Germany for consistent quality and precision

Specifications

• Bore size: 55.00 mm

• Actual piston size: 54.95 mm

• Display (cm³): 125

• Stroke (mm): 54.50

• Clearance (mm): 0.05

• Compression ratio: 2-stroke (Wossner and OEM)

• Compression height (mm): 28.00

Vehicle Fitments

• 1998 Yamaha WR125

• 1998 Yamaha YZ125 Base

• 1999 Yamaha WR125

• 1999 Yamaha YZ125 Base

• 2000 Yamaha WR125

• 2000 Yamaha YZ125 Base

• 2001 Yamaha WR125

• 2001 Yamaha YZ125 Base

Included Components

• Piston: Wossner PN# 8091D100

• Lock: PN# CW15

• Pin: PN# WP032

• Ring Set: PN# RSB5500

• Rod: PN# P2019