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No, QA50s are OHV 4-strokes, with pushrods as stated above. 2-speed/auto clutch. I'm not sure on this but I think the 2-speed trans is unique to the QA50, while the OHV 49cc top end design was used in various other applications, like the early 50cc cubs and a range of Euro-market mopeds. In the mopeds, I believe the design lasted into the 70s, around the time the QA made its relatively brief appearance.
 
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