Koso 4 Valve Cylinder Head - Honda Grom MSX 125

Koso 4 Valve Cylinder Head - Honda Grom MSX 125

SKU #: KOSO-1013

Cylinder Head Height: 14.2mm

Upper Gasket Thickness: 0.25mm

Piston Height: 19.5mm

Cylinder Displacement: 169.21cc

Squish: 1mm

Cylinder Head Titration: 13.4cc

Valve Clearance IN : 10mm, EX : 10mm

Spark Plug Type NGK-5869ER9EH

Camshaft Angle: 260

Torque (max): 1.71

Horsepower (max): 26.26

$685.00 In stock


Availability: In stock

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 air flow and performance are increased. This newly 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 24mm intake valves and 20mm exhaust valves. Feel the speed!




Aftermarket fuel controller and upgraded fuel injector is required. Professional installation is highly recommended!

Performance upgrades to the clutch is highly recommended!

Disclaimer:  NO WARRANTY ON RACE ENGINE parts or engine bore up kits.  There is no warranty stated or implied due to the unusual stresses placed on these parts and because we have no control over how they are installed and used.  Steady Garage will not be held liable for any failure or damage caused directly or indirectly from use of these products or engine.  The installation and use of these products or engine shall be conclusive evidence that the user assumes full responsibility for any damage caused directly or indirectly by their use.

This product is legal for closed-course competition use only; for racing vehicles (a competition vehicle not used on public highways). Intended for off-road use or race purposes; may not meet regulations of pollution controlled roads or highways. Not legal for vehicles registered and use in California. 

Additional Info : Brand New