My guess is these are 1979-ish XL185--at least that is where I would start. JT Sprocket's site is very in depth as far as dimensions go, if you don't want to yank your own sprocket off, yet.
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"They say that life's a carousel, spinning fast you got to ride it well..."
TGB Delivery Scooter 150
TMEC 200 Enduro--carcass is sadly rotting in the backyard
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