With the ATC 70 trike, 2 inches in the frame is needed, so something similar with the Pit Bikes, I suppose. They weigh 30kg and it is modified from a stand up design to a lay down. The chain lines up and pegs from an ATC 90 bolt up. Track and Trail in Newcastle have fitted one of my engines to a KTM 60, so anything is possible. They are $1,695 with a harness and carb.