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PISTON KIT 99-18 YZ250 66.40 C, WOSSNER 8216DC YAMAHA MX, 2 RING PISTON

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PISTON KIT 99-18 YZ250 66.40 C, WOSSNER 8216DC YAMAHA MX, 2 RING PISTON

PISTON KIT 99-18 YZ250 66.40 C, WOSSNER 8216DC YAMAHA MX, 2 RING PISTON

This Wossner piston kit with a 66.42mm bore (+0.02mm oversize, actual size 66.37mm) is designed for Yamaha YZ250 models from 1999 to 2018. Featuring a forged 2-ring design, it delivers enhanced durability, heat dissipation, and reliability under high-performance two-stroke engine conditions.



Features





  • Forged 2-ring piston for strength and long-lasting performance




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




  • Elliptical profile distributes load evenly, reducing localised pressure and risk of piston collapse




  • Precision-engineered and manufactured in Germany





Specifications





  • Bore size: 66.42 mm




  • Actual piston size: 66.37 mm




  • Display (cmĀ³): 249




  • Stroke (mm): 54.10




  • Clearance (mm): 0.06




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




  • Compression height (mm): 28.00





Vehicle Fitments





  • 1999ā€“2018 Yamaha YZ250





Included Components





  • Piston: Wossner PN# 8216DC (2-ring)




  • Lock: PN# CW18




  • Pin: PN# WP033




  • Ring Set: PN# RSB6640 x 2




  • Rod: PN# P2028



$100.82

Original: $288.07

-65%
PISTON KIT 99-18 YZ250 66.40 C, WOSSNER 8216DC YAMAHA MX, 2 RING PISTONā€”

$288.07

$100.82

Product Information

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Description

This Wossner piston kit with a 66.42mm bore (+0.02mm oversize, actual size 66.37mm) is designed for Yamaha YZ250 models from 1999 to 2018. Featuring a forged 2-ring design, it delivers enhanced durability, heat dissipation, and reliability under high-performance two-stroke engine conditions.



Features





  • Forged 2-ring piston for strength and long-lasting performance




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




  • Elliptical profile distributes load evenly, reducing localised pressure and risk of piston collapse




  • Precision-engineered and manufactured in Germany





Specifications





  • Bore size: 66.42 mm




  • Actual piston size: 66.37 mm




  • Display (cmĀ³): 249




  • Stroke (mm): 54.10




  • Clearance (mm): 0.06




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




  • Compression height (mm): 28.00





Vehicle Fitments





  • 1999ā€“2018 Yamaha YZ250





Included Components





  • Piston: Wossner PN# 8216DC (2-ring)




  • Lock: PN# CW18




  • Pin: PN# WP033




  • Ring Set: PN# RSB6640 x 2




  • Rod: PN# P2028



PISTON KIT 99-18 YZ250 66.40 C, WOSSNER 8216DC YAMAHA MX, 2 RING PISTON | SMXOFFROAD Ltd