Honda ATC90 ATV (1970-1978)

The Honda ATC90, initially introduced as the US90, made its mark in the all-terrain vehicle history from 1970 to 1978. Designed for adventure, this motorized tricycle was powered by an 89.5 cc (or 89cc) single-cylinder, horizontal, Overhead Valve (OHV), four-stroke, air-cooled engine, producing 7 horsepower. It featured a 4-speed dual-range semi-automatic clutch transmission, including both high and low range options. Its unique design notably lacked traditional suspension, relying instead on its low-pressure balloon tires to absorb terrain irregularities. While the core engine remained consistent, notable evolutions occurred. The most significant change was the rebranding from US90 to ATC90 starting in 1974, following Honda's successful trademarking of the "All Terrain Cycle" moniker. Concurrently, tire specifications were updated: US90 models (1970-1973) used 22 x 11 x 3.5 Ohtsu L-1/L-2 tires, whereas ATC90 models (1974-1978) transitioned to 22 x 11 x 8 Ohtsu B900 tires for both front and rear, with cheaper demountable tire designs becoming available in 1975. FAQ:

Q: How can I ensure parts compatibility for my Honda ATC90?

R: To guarantee compatibility, please use the year and model selector available on this page.

Maintenance