OEM Part For 49cc Wolf Brand Scooters Models Complete Cylinder Head for 49 cc 4-stroke QMB139 engines with 8mm exhaust studs Bolt Hole Spacing: 70.5 mm Intake Port Diameter: 17.5 mm Exhaust Port Diameter: 17 mm Emission System: PAIR (Pulsed Secondary Air Injection System) Intake and exhaust studs not included. Spark plug not included May also fit other Chinese Scooters, Mopeds, ATVs, 4 Wheelers, 3 Wheelers, Motor Cross, Pit Bikes, or Other Chinese Powersports MotorCycles / Bikes Other Brands May Include: Lance, Taotao, Kimco, Honda, Jonway, Peace, and ZNEN. Complete Cylinder Head for 49 cc 4-stroke QMB139 engines with 8mm exhaust studs. Bolt Hole Spacing: 70.5 mm, Intake Port Diameter: 17.5 mm, Exhaust Port Diameter: 17 mm, Emission System: PAIR (Pulsed Secondary Air Injection System), Intake and exhaust studs not included. Spark plug not included. May also fit other Chinese Scooters, Mopeds, ATVs, 4 Wheelers, 3 Wheelers, Motor Cross, Pit Bikes, or Other Chinese Powersports MotorCycles / Bikes