Yes, the 900 has more rated torque and more rated horsepower, but they are rated at a much higher RPM. The Honda's torque reaches it's peak at a lower RPM, or more quickly than the 900. By the time the 900 is turning the RPMs to reach it's "powerband", it is playing catch up. Since the 900 is also stationary, and in gear, something has to give to relieve stress on the drivetrain. In this case, the wheels spin, and the 900 loses traction. You can move a huge load, with a very small power source, IF you can utilize said power. As a child, I can remember people bringing in cotton wagons to my uncle's gin. More than once, I've seen people with full-sized (half-ton) pick-up trucks go out to move one around the lot, and not be able to budge it. They would sit on top of the gravel and spin their wheels. My uncle would send me out with an old Cub Cadet lawn tractor, with a hydrostatic transmission. It was rated at 15hp, and weighed less than half of their pick-ups. However, it had full torque across it's ENTIRE powerband. I could incrementally ease the power forward, until I had enough momentum to start the wagon moving. Smaller tires, less weight, and less than 20% of the rated horsepower and torque of any pick-up, but it would move a larger load. That's not traction, it's applied torque. The same mechanical principle is being demonstrated in the video.
