4 Valve Cylinder Head Kit

• Product Details

  The Koso 4V Cylinder Head kit for Honda GROM is the ideal engine part to complete the Koso Honda GROM Big Bore kit. Because of its unique 4 valve design, the airflow and performance are increased. This new designed head is the perfect addition for those who desire more power and torque. The 4 Valve Cylinder Head Kit features a forged piston, stainless steel 24 mm intake valves and 20 mm exhaust valves. Feel the speed!

  • Cylinder Height: 64.2 mm.
  • Gasket Thickness:
  • Upper: 0.25 mm.
  • Bottom: 0.5 mm.
  • Piston Compression Height: 19.5 mm.
  • Volume: 169.21cc.
  • Squish: 1 mm.
  • Cylinder Head Titration: 13.4cc.
  • Compression Ratio 12.3:1.
  • Valve Clearance / Tappet Clearance:
  • IN: 0.10 mm.
  • EX: 0.17 mm.
  • Camshaft: 260 degree.
  • Note: Fits Koso Big Bore kit ONLY.

  Note:

  This is an aftermarket part built for racing purposes ONLY. Koso is not responsible for any damages caused to the parts, vehicle, or to yourself and others. Engine parts are not under warranty nor is collateral damage or cost of labor, in cases of malfunction.

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• Fitment

• # Part Numbers

  Product Variant	Manufacturer Part #
  Koso 4 Valve Cylinder Head Kit	MC623000

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