You can buy similar on Amazon for $940!
1/4 Key Way
Heavy duty recoil starter
Air-cooled 4-stroke OHV
Bore x Stroke: 88 X 64 mm
Displacement: 389 cm3
Net Power Output: 11.7 HP (8.7 kW) @ 3,600 rpm
Net Torque: 19.5 lb-ft (26.4 Nm) @ 2,500 rpm
Oil Capacity: 1.16 US qt (1.1 L)
Fuel Tank Capacity: 6.4 U.S. qts (6.1 liters)
These are basically new, and were used at a trade show to move hydraulic lifts up and down for a couple of hours. They were removed from equipment and replaced with diesel engines for military.