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 I bought a second hand ZX50 Moped. At first the Starter button would not work. Eventually I put in a new Battery and that solved the problem.
               After several months I again had the Problem of Starter button not working. It worked fine from the kick start.
 A mechanic who services the bike at a place I take it too said they could look at it. He said it would cost me about $80 but was not sure at that stage what the problem was.
                     I advertised in  a magazine for a mechanic to do occasional work (advert was free in this magazine ).
           As a result a mechanic (or just someone more mechanical than me ) came around and fixed it in 5 minutes . He charged me $40.
                 He wouldn't tell me how he did it. But he took off two black plastic tabs near the breaks. That gave him access to something on the handles.
He did say it was something to do with the Kill switch.
                 Now instead of usually squeezing the break near the starter button (on my bike that's on the right hand side ) I now squeeze the break on the Left hand side while depressing the starter BUTTON.
                    whatever HE DID IT NOW WORKS.iT APPEARS TO BE SOMETHING TO DO WITH THE kILL SWITCH