Universal Parts 50mm QMB139 Non Emissions Head - 69mm Valves
$51.99
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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
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