Hoca Replacement QMB139 Cylinder Head Valves, Part #169-381
Hoca Replacement QMB139 Valve Set for the 50mm and 52mm Hoca Cylinder Heads used on 50cc QMB139 4-stroke engines and engine based vehicles. Intake Valve Diameter: 21.5mm. Exhaust Valve Diameter: 19mm. Intake & Exhaust Valve Overall Length: 62.3mm. Intake & Exhaust Valve Stem Diameter: 5mm.