would that be considered a 2 stroke?

Whoa! I remember those from when I was a kid back in the 70's. I think I even had one or knew someone who had one. I know I've ridden one before. However, I don't recall them having 3 wheels. I think the one I tried to ride only had 2.

But $500? They were probably $30 back in the 70's...if that much.

Maybe the 3 wheels are what make it the senior model so the old folks that can still ride It don't fall over
Shubey