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PISTON KIT 99-18 YZ250 66.40 B, WOSSNER 8216DB YAMAHA MX, 2 RING PISTON

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PISTON KIT 99-18 YZ250 66.40 B, WOSSNER 8216DB YAMAHA MX, 2 RING PISTON

PISTON KIT 99-18 YZ250 66.40 B, WOSSNER 8216DB YAMAHA MX, 2 RING PISTON

This Wossner piston kit with a 66.41mm bore (+0.01mm oversize, actual size 66.36mm) is designed for Yamaha YZ250 models from 1999 to 2018. The forged 2-ring piston is engineered for high-performance applications, offering strength, thermal efficiency, and reliability in demanding two-stroke engines.



Features





  • Forged construction for maximum strength and durability




  • Optimised for effective heat transfer from combustion chamber to cylinder walls




  • Elliptical shape ensures uniform bearing surface and reduces the risk of piston collapse under thermal stress




  • Precision-made in Germany





Specifications





  • Bore size: 66.41 mm




  • Actual piston size: 66.36 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# 8216DB (2-ring)




  • Lock: PN# CW18




  • Pin: PN# WP033




  • Ring Set: PN# RSB6640 x 2




  • Rod: PN# P2028



$93.36

Original: $266.73

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

$266.73

$93.36

Product Information

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Description

This Wossner piston kit with a 66.41mm bore (+0.01mm oversize, actual size 66.36mm) is designed for Yamaha YZ250 models from 1999 to 2018. The forged 2-ring piston is engineered for high-performance applications, offering strength, thermal efficiency, and reliability in demanding two-stroke engines.



Features





  • Forged construction for maximum strength and durability




  • Optimised for effective heat transfer from combustion chamber to cylinder walls




  • Elliptical shape ensures uniform bearing surface and reduces the risk of piston collapse under thermal stress




  • Precision-made in Germany





Specifications





  • Bore size: 66.41 mm




  • Actual piston size: 66.36 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# 8216DB (2-ring)




  • Lock: PN# CW18




  • Pin: PN# WP033




  • Ring Set: PN# RSB6640 x 2




  • Rod: PN# P2028



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