Universal Parts 50mm QMB139 Non Emissions Head – 69mm Valves

50cc QMB139 4-stroke 50mm, Non Emissions Cylinder Head with 69mm Valves for use with 81.3cc Big Bore Kit! (See Related Items) *You may need to modify your engine case to accommodate the larger cylinder.
For Use With 81.3cc Big Bore Kit
Valve Length: 69mm
Overall Height: 59.5mm
Intake Port Diameter: 18mm
Exhaust Port Diameter: 17mm
Intake Bolt Hole Spacing: 44.5mm
Exhaust Bolt Hole Spacing: 50mm
SUPPORTED MODELS: QMB139 50cc/49cc , Various unlisted makes/models