Koso Honda Grom Complete 4 Valve Kit
Koso Honda Grom 4 Valve Cylinder Head Package
Koso Honda Grom 4V Head and Big Bore Kit
Koso Honda Grom 4V Head Camshaft

KOSO

KOSO Honda Grom/Monkey 170cc 4 Valve Performance Cylinder Kit w/ Forged Piston (2014-2020)

$1,250.00 $1,299.00
Quantity:
Pickup available at 1860 Obispo Avenue Usually ready in 24 hours

KOSO Honda Grom/Monkey 170cc 4 Valve Performance Cylinder Kit w/ Forged Piston (2014-2020)

1860 Obispo Avenue

Pickup available, usually ready in 24 hours

1860 Obispo Avenue
C
Signal Hill CA 90755
United States

5623351564

Koso 2014-2020 Honda Grom 4 valve head and 61mm performance cylinder kit with a forged piston. This is a completely 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. This is a performance engine part, there are no returns on performance parts or individual pieces.

Need a replacement piston, see our KOSO 4V Replacement Piston Kit.

Koso Honda Grom 4-Valve Package Includes:

  • Koso 4V Cylinder Head
  • Koso Camshaft
  • Koso Intake Manifold
  • Koso 61mm Ceramic Coated Cylinder
  • Koso 61mm 4V Forged Piston

Supporting Parts:

  • Koso 34mm Throttle Body(Required)
  • Honda PCX150cc Injector (Required)
  • aRacer RC Super X or Mini-X Fuel Controller (Required)
  • Spark PlugNGK ER9EH (Required)
  • Koso High Flow Oil Pump (Recommend)
  • Koso Cam Chain Tensioner (Recommend)
  • Kitaco Crankshaft (Recommend)
  • Juggernaut Oil Cooler Kit (Recommend)

Spec:

  • Compression Ratio: 12.3:1
  • Cylinder Displacement: 169.2cc
  • Power: +25hp
  • RPM Redline: 12,500RPM
  • Recommend: 92-93 Octane