Koso 4V head kit w/ 170cc Big Bore kit

NOTE: Requires PART #s 1010-1865, 1022-0154, 1050-0344, 1050-0345, 1022-0153, 1022-0227, 1021-0013, 0932-0167 and 2103-0362.

• Proper exhaust system must be used to prevent re-flow pressure and heat.
• Ideal engine part to complete Koso's big bore kit
• Unique four-valve design increases air flow and performance
• Provides more power and torque
• Features a forged piston, stainless steel 24 mm intake valves and 20 mm exhaust valves