Cylinder Head & Valve Assembly; CSC go., 139QMB Scooters single seat Upgrade your Honda Ruckus or

Upgrade your Honda Ruckus or Metropolitan's CVT with the NCY 95mm Gold Variator Pulley

Long experience and collaboration with some of the biggest brands in the industry

Whether you are maneuvering in tight corners or commuting at highway speeds

High-Tension White Counterpressure Spring: Includes an upgraded racing torque spring (+30% stiffness) to prevent belt slippage and optimize rear pulley back-shifting during corner exits

Cylinder Head & Valve Assembly; CSC go., 139QMB Scooters single seat Upgrade your Honda Ruckus orThis assembled PAIR style cylinder head fits CSC go, go MAX and Pug scooters and bikes running 50cc 4 stroke 139QMB engines. Pulsed Secondary Air Injection System (PAIR) is an emissions control system used to lower hydrocarbon (HC) and carbon monoxide (CO) emissions by allowing air into the exhaust flow. Original Parts For Scooters SKU 151 240 Specifications: Intake Port Diameter: 17mm Exhaust Port Diameter: 17mm Valve Length: 69mm Emission Control