Skip to product information
PISTON KIT 99-18 YZ250 1-RING, WOSSNER 8217DA 66.40 A
  • PISTON KIT 99-18 YZ250 1-RING, WOSSNER 8217DA 66.40 A
  • PISTON KIT 99-18 YZ250 1-RING, WOSSNER 8217DA 66.40 A
  • PISTON KIT 99-18 YZ250 1-RING, WOSSNER 8217DA 66.40 A
  • PISTON KIT 99-18 YZ250 1-RING, WOSSNER 8217DA 66.40 A
PISTON KIT 99-18 YZ250 1-RING, WOSSNER 8217DA 66.40 A

PISTON KIT 99-18 YZ250 1-RING, WOSSNER 8217DA 66.40 A

£129.75 GBP
Taxes included.

This Wossner piston kit with a 66.40mm bore (actual size 66.35mm) features a single-ring piston designed specifically for Yamaha YZ250 models from 1999 to 2018. Forged in Germany, it offers durability, thermal efficiency, and reduced friction for high-performance two-stroke engines.

Features

  • Forged single-ring piston for reduced friction and improved response

  • Engineered for efficient heat dissipation to cylinder walls

  • Elliptical design distributes load evenly to prevent localised pressure and piston collapse

  • Manufactured in Germany for reliability and precision

Specifications

  • Bore size: 66.40 mm

  • Actual piston size: 66.35 mm

  • Display (cm³): 249

  • Stroke (mm): 68.00

  • Clearance (mm): 0.05

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

  • Compression height (mm): 38.00

Cross-Reference OEM Part Numbers

  • OLD No. 56-W056.WO.A

Vehicle Fitments

  • 1999–2018 Yamaha YZ250

Included Components

  • Piston: Wossner PN# 8217DA (Single ring)

  • Gasket: PN# D2041

  • Lock: PN# CW18

  • Pin: PN# WP033

  • Ring Set: PN# RSB6640

  • Rod: PN# P2028