My friends mini motor got stolen then the next morning I found this part outside my house. I was wondering what it was as I don't know if it was part of it. 
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This looks like a throttle plate of a motor bike – method Feb 23 '17 at 20:46
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2Do they give the engine back piecewise? – Martin Feb 23 '17 at 21:11
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I cannot tell you if this was part of the scooter, but it does fit to the carburetor, as the lever looks to control a choke. The annotation on the edge of the circular part has an arrow and says, "Open". Without more context, it would be very hard to know what this belongs to. – Pᴀᴜʟsᴛᴇʀ2♦ Feb 23 '17 at 21:30
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@paulster2 it does say open on the side of it yeah – Roy Feb 23 '17 at 22:06
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I had a piece identical to this on my motorized bicycle. I don't know its particular function but I used it to start and shut the bike as my kill switch button was broken. And like paulster said it is attached to the carb – method Feb 23 '17 at 22:27
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This looks like an engine shut-off valve. (Fuel valve or petcock etc.) https://en.wikipedia.org/wiki/Petcock
