Decrease quantity Increase quantity

Sold out

• High compression pop-up piston (with dome).
  
• Compression ratio: 9.5:1.
  
• Piston weight: 392 g.
  
• Pin weight: 97 g.
  
• Head type: Domed.
  
• Dome volume: -9 cc.
  
• Compression height: 1.375".
  
• Bore: 3.4980".
  
• Stroke: 4.250" (4 1/4").
  
• Rod length: 7.440".
  
• Cylinder length: 5.550".
  
• Includes hypereutectic cast pistons (390 alloy) with T6 heat treatment and 16% silicon content, allowing for very tight tolerances for greater durability and minimized piston noise.
  
• Note: Top compression ring will require additional gap. Refer to instructions.
  
• For 84-99 Evo Big Twin
  
• KB Performance Piston KB305040