19?? Indian Chief Motor: 74 Cubic Inch Engine.
This is a one wheeled Wheelie Sled. It is for Drag Racing. This sled has a small platform behind the front (only) wheel, where the rider stands, and a wheelie bar to keep it from doing summersaults. The idea is two machines line up and they loose points if the rear wheelie bar or the front pad where the motor sits touches the ground, while the first one across the line wins. These wheelie bikes have been made using many different engines. This one happens to be a late model Chief !!