2Bros Parts

PISTON KIT 99-08 TRX XR 85.00, FORGED WOSSNER 8702DB 400

£187.82
1

Wossner forged piston kit with an 85.01mm bore. Manufactured in Germany, this high-performance piston enhances strength, heat transfer, and durability. The elliptical design ensures uniform bearing surface distribution, reducing localized pressure and preventing piston collapse. Features include forged construction for superior strength and durability, optimized heat transfer to cylinder walls, elliptical design for uniform bearing surface under heat expansion, and increased compression ratio for improved engine performance. Specifications include a bore of 85.01mm (84.94mm actual), display of 397 cm³, stroke of 70.00mm, clearance of 0.06mm, Wossner Compression Ratio of 12.50:1, OEM Compression Ratio of 10.00:1, Dome Volume of +8.40 cm³, and Compression Height of 26.20mm. Cross-reference OEM part numbers include Wossner Piston 8702DB, Lock CW20, Pin WP052, Ring Set 850XSY, and Rod P4021.

Specifications
SKU
56-W4628.B.WO
Brand
Wossner
Availability
In Stock (1)

Fitments (40)

MakeModelYear
HONDATRX EX 4001999
HONDATRX EX 4002000
HONDATRX EX 4002001
HONDATRX EX 4002002
HONDATRX EX 4002003
HONDATRX EX 4002004
HONDATRX EX 4002005
HONDATRX EX 4002006
HONDATRX EX 4002007
HONDATRX EX 4002008
HONDATRX EX 4002009
HONDATRX EX 4002010
HONDATRX EX 4002011
HONDATRX EX 4002012
HONDATRX EX 4002013
HONDATRX EX 4002014
HONDATRX X 4002009
HONDATRX X 4002010
HONDATRX X 4002011
HONDATRX X 4002012
HONDATRX X 4002013
HONDATRX X 4002014
HONDAXR 4001996
HONDAXR 4001997
HONDAXR 4001998
HONDAXR 4001999
HONDAXR 4002000
HONDAXR 4002001
HONDAXR 4002002
HONDAXR 4002003
HONDAXR 4002004
HONDAXR 400R1996
HONDAXR 400R1997
HONDAXR 400R1998
HONDAXR 400R1999
HONDAXR 400R2000
HONDAXR 400R2001
HONDAXR 400R2002
HONDAXR 400R2003
HONDAXR 400R2004
General Product Group
Engine
General Product Type
Pistons & Kits
General Size
85mm
Variant Id
255781
Shipping OptionsShown at checkout
14-Day ReturnsHassle-free
Easy CheckoutCard friendly
Product details

FULL DESCRIPTION

Wössner Forged Piston Kit 85.01mm for Honda TRX400

This Wössner forged piston kit is engineered for high-performance applications, featuring an 85.01mm bore. Manufactured in Germany, it utilizes advanced forged construction to significantly enhance strength, heat transfer, and overall durability. The piston's innovative elliptical design promotes uniform bearing surface distribution, effectively reducing localized pressure and preventing piston collapse under extreme operating conditions. This results in a noticeable increase in the engine's compression ratio for improved performance.

Key Features:

  • Forged Construction: Provides superior strength and long-lasting durability.
  • Optimized Heat Transfer: Enhances efficient heat management to cylinder walls.
  • Elliptical Design: Ensures even bearing surface distribution, even under thermal expansion.
  • Increased Compression Ratio: Boosts engine performance with a 12.50:1 ratio compared to OEM 10.00:1.
  • Premium Quality: Manufactured in Germany for precision and reliability.

Specifications:

  • Actual Bore: 84.94mm
  • Nominal Bore: 85.01mm
  • Displacement: 397 cm³
  • Stroke: 70.00mm
  • Piston Clearance: 0.06mm
  • Wössner Compression Ratio: 12.50:1
  • Dome Volume: +8.40 cm³
  • Compression Height: 26.20mm

Included Components:

  • Wössner Piston: 8702DB
  • Lock: CW20
  • Pin: WP052
  • Ring Set: 850XSY
  • Rod: P4021
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