šŸŽ‰ Up to 70% Off Selected ItemsShop Sale
HomeStore

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

Product image 1
Product image 2

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

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

This Wossner piston kit with a 66.41mm bore (+0.01mm oversize, actual size 66.36mm) is specifically designed for Yamaha YZ250 models from 1999 to 2018. Featuring a single-ring forged design, it delivers reduced friction, reliable performance, and durability under the demands of two-stroke operation.



Features





  • Forged single-ring piston enhances response and reduces friction




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




  • Elliptical design distributes load evenly and prevents piston collapse during thermal expansion




  • Manufactured in Germany for high precision and reliability





Specifications





  • Bore size: 66.41 mm




  • Actual piston size: 66.36 mm




  • Display (cmĀ³): 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.B





Vehicle Fitments





  • 1999ā€“2018 Yamaha YZ250





Included Components





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




  • Gasket: PN# D2041




  • Lock: PN# CW18




  • Pin: PN# WP033




  • Ring Set: PN# RSB6640




  • Rod: PN# P2028



$106.89

Original: $305.41

-65%
PISTON KIT 99-18 YZ250 1-RING, WOSSNER 8217DB 66.40ā€”

$305.41

$106.89

Product Information

Shipping & Returns

Description

This Wossner piston kit with a 66.41mm bore (+0.01mm oversize, actual size 66.36mm) is specifically designed for Yamaha YZ250 models from 1999 to 2018. Featuring a single-ring forged design, it delivers reduced friction, reliable performance, and durability under the demands of two-stroke operation.



Features





  • Forged single-ring piston enhances response and reduces friction




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




  • Elliptical design distributes load evenly and prevents piston collapse during thermal expansion




  • Manufactured in Germany for high precision and reliability





Specifications





  • Bore size: 66.41 mm




  • Actual piston size: 66.36 mm




  • Display (cmĀ³): 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.B





Vehicle Fitments





  • 1999ā€“2018 Yamaha YZ250





Included Components





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




  • Gasket: PN# D2041




  • Lock: PN# CW18




  • Pin: PN# WP033




  • Ring Set: PN# RSB6640




  • Rod: PN# P2028



PISTON KIT 99-18 YZ250 1-RING, WOSSNER 8217DB 66.40 | SMXOFFROAD Ltd