39mm Cylinder Head assembly with valve for Chinese Scooter Kart ATV Moped 4 Stroke 139QMB 137QMA GY6 50 cc Engine Parts 39mm Cylinder Head assembly with valve for Chinese Scooter Kart ATV Moped 4 Stroke 139QMB 137QMA GY6 50 cc Engine Parts. Sale price : $34.01 Category : Motorcycle Equipments & Parts