
Koso 4V Cylinder Head Kit - Honda Grom & Monkey
The Koso 4V Cylinder Head kit for the Honda Grom and Honda Monkey is the ideal engine part to complete the Koso 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!
*Please note: Compatible with 2014-2021 Honda Grom
- Vendor Part Number: MC623000
- 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
Original: $749.99
-65%$749.99
$262.50More Images




Koso 4V Cylinder Head Kit - Honda Grom & Monkey
The Koso 4V Cylinder Head kit for the Honda Grom and Honda Monkey is the ideal engine part to complete the Koso 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!
*Please note: Compatible with 2014-2021 Honda Grom
- Vendor Part Number: MC623000
- 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
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Koso 4V Cylinder Head kit for the Honda Grom and Honda Monkey is the ideal engine part to complete the Koso 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!
*Please note: Compatible with 2014-2021 Honda Grom
- Vendor Part Number: MC623000
- 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




















