2Bros Parts

PISTON 99-09 TM250 66.4 DOME, WOSSNER 8137DD FORGED KIT, SINGLE RING

£153.68

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Wossner 56-W021.D.WO forged piston kit for 2-stroke engines. Features a 66.4mm dome, single ring, and forged construction for enhanced durability and performance. Optimized heat transfer from the combustion chamber to cylinder walls. Elliptical design ensures uniform bearing surface under heat expansion, reducing localized pressure and distributing thrust loads evenly to prevent piston collapse. Manufactured in Germany. Bore: 66.36 mm, Piston Size: 66.44 mm, Displacement: 249 cm³, Stroke: 72.00 mm, Clearance: 0.07 mm. Dome Volume: Domed, Compression Height: 38.00 mm. Cross-reference OEM part numbers: Lock: CW18, Pin: WP033, Ring Set: RSB6640 x2.

Specifications
SKU
56-W021.D.WO
Brand
Wossner
Availability
In Stock (3)

Fitments (87)

MakeModelYear
TMCROSS 2501999
TMCROSS 2502000
TMCROSS 2502001
TMCROSS 2502002
TMCROSS 2502003
TMCROSS 2502004
TMCROSS 2502005
TMCROSS 2502006
TMCROSS 2502007
TMCROSS 2502008
TMCROSS 2502009
TMCROSS 2502010
TMCROSS 2502011
TMCROSS 2502012
TMCROSS 2502013
TMCROSS 2502014
TMCROSS 2502015
TMCROSS 2502016
TMCROSS 2502017
TMCROSS 2502018
TMCROSS 2502019
TMEN 2501999
TMEN 2502000
TMEN 2502001
TMEN 2502002
TMEN 2502003
TMEN 2502004
TMEN 2502005
TMEN 2502006
TMEN 2502007
TMEN 2502008
TMEN 2502009
TMEN 2502010
TMEN 2502011
TMEN 2502012
TMEN 2502013
TMENDURO 2501999
TMENDURO 2502000
TMENDURO 2502001
TMENDURO 2502002
TMENDURO 2502003
TMENDURO 2502004
TMENDURO 2502005
TMENDURO 2502006
TMENDURO 2502007
TMENDURO 2502008
TMENDURO 2502009
TMENDURO 2502010
TMENDURO 2502011
TMENDURO 2502012
TMENDURO 2502013
TMENDURO 2502014
TMENDURO 2502015
TMENDURO 2502016
TMENDURO 2502017
TMENDURO 2502018
TMENDURO 2502019
TMMX 2501999
TMMX 2502000
TMMX 2502001
TMMX 2502002
TMMX 2502003
TMMX 2502004
TMMX 2502005
TMMX 2502006
TMMX 2502007
TMMX 2502008
TMMX 2502009
TMMX 2502010
TMMX 2502011
TMMX 2502012
TMMX 2502013
TMTM 2501999
TMTM 2502000
TMTM 2502001
TMTM 2502002
TMTM 2502003
TMTM 2502004
TMTM 2502005
TMTM 2502006
TMTM 2502007
TMTM 2502008
TMTM 2502009
TMTM 2502010
TMTM 2502011
TMTM 2502012
TMTM 2502013
General Product Group
Engine
General Product Type
Pistons & Kits
Variant Id
254281
Delivery2–4 business days
14-Day ReturnsHassle-free
Easy CheckoutCard friendly
Product details

FULL DESCRIPTION

Wossner 66.44mm Forged Piston Kit for 2-Stroke Engines

This Wossner forged piston kit is engineered for enhanced strength and superior performance in 2-stroke motorcycle engines. It is meticulously designed to optimize heat transfer from the combustion chamber directly to the cylinder walls, ensuring efficient operation. The unique elliptical design of the piston surface guarantees a uniform bearing area even under extreme heat expansion. This feature effectively reduces localized pressure and distributes thrust loads evenly across the piston skirt, preventing premature piston collapse and extending component life.

Key Features:

  • Forged Construction: Provides exceptional durability and resistance to stress for high-performance applications.
  • Optimized Heat Transfer: Facilitates efficient heat dissipation, contributing to consistent power output and engine longevity.
  • Elliptical Piston Design: Ensures even load distribution and prevents localized pressure points, enhancing stability and preventing collapse under thermal stress.
  • Domed Piston Top: Designed to increase combustion efficiency and power output.
  • Single-Ring Configuration: Minimizes friction for improved engine responsiveness and peak performance.

Specifications:

  • Bore Size: 66.36 mm
  • Piston Diameter: 66.44 mm
  • Engine Displacement: 249 cm³
  • Stroke Length: 72.00 mm
  • Piston Clearance: 0.07 mm
  • Dome Volume: Domed
  • Compression Height: 38.00 mm
  • Piston Material: Forged Aluminum Alloy
Before you buy

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Check the fitment table on this page against your make, model and year. Not sure? Call or email us and we will check it for you before you order.

UK delivery is £4.99, or free on orders over £60. Orders ship within 3 working days, then delivery takes 2–4 business days. Delivery details

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