This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1971 Honda ATC90 is a third model year example of the vehicle widely credited as the first ATV. There were earlier ATV-like machines of course, but the ATC was arguably the first to offer go-anywhere performance within a neatly packaged, easy-to-ride, reliable, attractive, and compact package. This one appears to be in remarkably well-preserved condition, and a similar, slightly scruffier (but still very nice) bright green example is also available separately. Find the red one here on eBay in Staten Island, New York with reserve not met. Special thanks to BaT reader Kyle K. for this submission.
The trike is described as all-original, and sounds to have been carefully stored by its original owner for many years. Running condition isn’t mentioned, but the seller does refer to condition as “mint.” A few very minor signs of use like the scratched tank show that this assessment is perhaps a bit glowing, but overall, condition does look to be quite impressive.
Power comes from a neatly packaged, 90cc, OHC four good for about 7 HP at 8,500 RPM. This is passed to the rear axle via an automatic clutch (the lever is for the single, rear-only brake) and interesting dual-range 4-speed gearbox–effectively offering eight forward gears. Balloon-like tires appear to be OEM and presumably are still in good shape, as only the green example is said to need new ones–sourcing suitable replacements might not be easy. Low pressure allows for better traction on snow, sand, and mud, and also negates the need for a traditional suspension system.
Notably, the green example is said to run, and the seller adds that it can be had for $4,500. Presumably this red trike is still running as well, as reserve is still not met at $5k at the time of writing.