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I forgot how fantastic they were.I started on an SL70. That is a great example, is it yours ? Over here they were called a QA 50 if memory serves..
QA50 was another, but, different, 50cc model with a pushrod motor, vs. the OHC motor on the Z50, also smaller diameter, but fatter wheels/tires, and completely different bodywork. The frame, if not the same as, is similar to the earliest, hardtail Z50's.