The ATC250R is a high-performance ATV produced by Honda from 1981 to 1986. Early models (1981-1984) used an air-cooled, 248 cc single-cylinder two-stroke engine. Fuel was fed through a 27 mm (1981-1982) or 30 mm (1983-1984) round-slide carburetor. Power was accessed through a close-ratio five-speed transmission with a manual clutch. Later models (1985-1986) used a liquid-cooled, 246 cc single-cylinder two-stroke engine with a 34 mm round (1985) or flat (1986) slide carburetor. The biggest engine downfall was the lack of a power valve. The 85-86 models were upgraded with a close-ratio six speed transmission again with a manual clutch.