PISTON KIT 87-90 TRX250 67.00, WOSSNER 8189DA HONDA ATV

Wossner forged piston kit for Honda ATC250R and TRX250R models from 1987 to 1990, featuring an oversize bore of 67.00 mm (+1.00 mm). Engineered for demanding 2-stroke performance, this piston utilises a forged construction and an elliptical profile to manage heat expansion effectively. This design helps distribute thrust loads evenly and minimise stress concentrations, ensuring long-lasting engine reliability. Manufactured in Germany to exacting standards.

Features

• 
  

  Forged piston for high strength and thermal resistance

  
  


• 
  

  Optimised for effective heat transfer from combustion chamber to cylinder wall

  
  


• 
  

  Elliptical design provides uniform expansion and prevents localised pressure

  
  


• 
  

  Intended for high-performance 2-stroke engine use

  
  


• 
  

  Made in Germany

  
  

Specifications

• 
  

  Bore: 67.00 mm

  
  


• 
  

  Actual Bore Diameter: 66.94 mm

  
  


• 
  

  Compression Height: 33.00 mm

  
  


• 
  

  Display Volume: 246 cm³

  
  


• 
  

  Stroke: 72.00 mm

  
  


• 
  

  Clearance: 0.06 mm

  
  


• 
  

  Compression Ratio: 2-stroke (Wossner and OEM)

  
  

Cross-Reference OEM Part Numbers

• 
  

  Piston Kit Part No.: 8189D100

  
  


• 
  

  Lock P/N: CW18

  
  


• 
  

  Pin P/N: WP033

  
  


• 
  

  Ring Set P/N: RSB6700 (x2)

  
  


• 
  

  Alternate Part No.: 56-W562.P4.WO

  
  

Vehicle Fitments

• 
  

  Honda ATC250R (1987–1990)

  
  


• 
  

  Honda TRX250R (1987–1990)