OK, so perhaps it's not that rare but, I've never seen one before, so for me it's rare. I even got a ride. The thing is so quiet it feels like it's got an electric motor. Not much speed but fantastic mileage from a motor who's engine block isn't much bigger than the battery. I think it's suppose to be 44 cu with a power output of 26.5 hp.
Don picked it up in pretty horrible condition and did a frame off. It sure attracts attention at the shows.
DT