QMB139 Performance Valve Set
Performance QMB139 Valve Set
Replacement QMB139 Valve Set for the Cylinder Heads used on 50cc QMB139 4-stroke engines and engine based vehicles. Most 50-90cc 4-stroke Chinese Scooters & belt drive ATVs use these unless they have the 69mm tall version, please measure yours before ordering.
- Intake Valve Diameter: 18.5mm
- Exhaust Valve Diameter: 16mm
- Intake & Exhaust Valve Overall Length: 64mm
- Intake & Exhaust Valve Stem Diameter: 5mm