My first was a red Gremlin. 5hp single stroke if I recall. I was however 8 years old and its debatable about it being my coin. I do remember something about an allowance swap!
I drove this thing hard until I could no longer fit. It went topless within the first year and we had to weld the frame back together at least three times as the fun was had in the fields with lots of holes and rocks.
(this is not my photo btw, although there might be one buried in my parents photo albums back east)