Description
Universal Parts Complete 50mm Big Bore Top End Kit for 50cc 4-stroke QMB139 engines. Upgrades to 81.3cc based on a stock stroke of 41.4mm! Includes cylinder, cylinder head, piston, pin, circlips, rings, head gasket, base gasket, camshaft, rocker arm shafts, rocker arms, cam holder, spark plug, intake studs, and exhaust studs. *You may need to modify your engine case to accommodate the larger cylinder.
Upgrades to 81.3cc!
Includes Camshaft
NGK Brand Spark Plug
Bore: 50mm
Cylinder Overall Height: 70mm
Cylinder Sleeve Outer Diameter: 54mm
Head Comes with 64mm Length Valves
SUPPORTED MODELS: QMB139 50cc/49cc , Various unlisted makes/models