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Koso Honda Grom Four Valve Cylinder Head with 61mm Big Bore Cylinder Kit (170cc)

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Availability: In stock

From: $16.00

To: $1,303.98

Price as configured: $0.00

Koso Grom 125 61mm Big Bore Cylinder Kit with 4 Valve Cylinder Head is probably one of the best big bore kit available on the market for the Grom.

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Price as configured: $0.00



Koso Honda Grom 4 valve head and 61mm big bore cylinder kit with forged piston. This is a complete newly designed head using a pair of 24mm intake/21mm valves exhaust valves with matching large intake and exhaust port.  This Koso 4 Valve can produce up to 23-26hp vs. stock 8-9hp.

Fuel tuning is required before you can hit the streets with this kit.  We recommend getting the aRacer DG1 Multi-Function Display & AF1 Wideband Combo Kit. 

Additional Info

Additional Info


Koso Honda Grom 4Valve Head with 61mm Cylinder Kit

  • Koso 4V Cylinder Head
  • Koso Camshaft
  • Koso Intake Manifold
  • Koso 34mm Throttle Body
  • Koso 61mm 4V Forged Piston 
  • Koso 61mm Ceramic Coated Cylinder
  • Honda PCX150cc Injector
  • Bazzaz ZFI Fuel Controller
  • Spark PlugNGK CPR9EA-9 
  • Compression Ratio: 12.3:1
  • Cylinder Displacement: 169.2cc
  • Power: +20HP
  • Only use +91 Oct
Brand Koso


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