Skip to product information
PISTON KIT 98-01 YZ125 54.00 A, WOSSNER 8091DA YAMAHA MX 4XM-11631-30-A0
  • PISTON KIT 98-01 YZ125 54.00 A, WOSSNER 8091DA YAMAHA MX 4XM-11631-30-A0
  • PISTON KIT 98-01 YZ125 54.00 A, WOSSNER 8091DA YAMAHA MX 4XM-11631-30-A0
  • PISTON KIT 98-01 YZ125 54.00 A, WOSSNER 8091DA YAMAHA MX 4XM-11631-30-A0
  • PISTON KIT 98-01 YZ125 54.00 A, WOSSNER 8091DA YAMAHA MX 4XM-11631-30-A0
  • PISTON KIT 98-01 YZ125 54.00 A, WOSSNER 8091DA YAMAHA MX 4XM-11631-30-A0
  • PISTON KIT 98-01 YZ125 54.00 A, WOSSNER 8091DA YAMAHA MX 4XM-11631-30-A0
  • PISTON KIT 98-01 YZ125 54.00 A, WOSSNER 8091DA YAMAHA MX 4XM-11631-30-A0
  • PISTON KIT 98-01 YZ125 54.00 A, WOSSNER 8091DA YAMAHA MX 4XM-11631-30-A0
PISTON KIT 98-01 YZ125 54.00 A, WOSSNER 8091DA YAMAHA MX 4XM-11631-30-A0

PISTON KIT 98-01 YZ125 54.00 A, WOSSNER 8091DA YAMAHA MX 4XM-11631-30-A0

£97.07 GBP
Taxes included.

This Wossner piston kit with a 54.00mm bore is designed for Yamaha YZ125 and WR125 models from 1998 to 2001. Precision-forged in Germany, it delivers exceptional strength, heat dissipation, and reliability for two-stroke performance applications.

Features

  • Forged piston construction provides high strength and durability

  • Optimised for effective heat transfer from the combustion chamber to the cylinder wall

  • Elliptical shape enhances load distribution and reduces risk of piston collapse under heat expansion

  • Manufactured in Germany for precision and quality

Specifications

  • Bore size: 54.00 mm

  • Actual piston size: 53.95 mm

  • Display (cm³): 125

  • Stroke (mm): 54.50

  • Clearance (mm): 0.05

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

  • Dome volume: Not specified

  • Compression height (mm): 28.00

  • Theoretical weight: Not specified

Cross-Reference OEM Part Numbers

  • 4XM-11631-30-A0

  • 09104819

  • 726M05400

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# 8091DA

  • Lock: PN# CW15

  • Pin: PN# WP032

  • Ring Set: PN# RSB5400

  • Rod: PN# P2019