Congratulations to RoadRash, who was the first to identify that is the frame from a Hercules W2000!
The big difference here is of course the lower rails, which are designed to hold a 294cc Fichtel & Sachs single-rotor air-cooled snowmobile engine – that’s right, this is rotary powered!
Well done, RoadRash! Looks like i’ve got to come up with something more difficult for the next round of Guess That Bike. If you’ve got any suggestions, feel free to send them in: abhi AT bike-urious DOT com.