Universal Parts QMB139 Cylinder & Head Kit - 69mm Valves
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50cc QMB139 4-stroke Cylinder and Head Kit With 69mm Valves. Choose from 39mm, 47mm or 50mm bore in the Drop Down Box. 47mm Bore Upgrades your Scooter to 72cc! 50mm Bore Upgrades your Scooter to 81.3cc!  Kit includes complete cylinder head, cylinder, piston, rings, piston pin, cir clips, head gasket, and base gasket. *You may need to modify your engine case to accommodate the larger cylinder. Cylinder Bore: Choose from 39mm, 47mm or 50mm Cylinder Sleeve Outer Diameter: 45mm (39mm bore) / 52.8mm (47mm bore) / 52.6mm (50mm bore) Wrist Pin Diameter: 13mm Total Piston Height: 34.4mm Compression Height (from center of wrist pin hole to top edge of piston): 17.25mm Intake and Exhaust Valve Length: 69mm Non-Emissions Head QMB139 50cc/49cc
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