| MODEL | HONDA ATC 250R THREE-WHEELER 1981 - 1986 |
| Year | 1981 - 1986 |
| Engine Type | Two stroke, single cylinder, with balancer shaft |
| Displacement / Capacity | 248 cc (1981-84); 246 cc (1985-86) |
| Bore X Stroke | 66 x 72 mm (1985-86) |
| Compression Ratio | — |
| Cooling System | Air cooled (1981-84); liquid cooled (1985-86) |
| Max Power | — |
| Max Torque | — |
| Ignition | CDI |
| Induction | 27 mm carburettor (1981-82); 30 mm round-slide carburettor (1983-84); 34 mm carburettor (1985-86) |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5-speed (1981-84); 6-speed (1985-86) |
| Clutch | Wet multi-plate, manual |
| Final Drive | — |
| CHASSIS SPECS | |
| Frame | Steel |
| Front Suspension | Air-assisted telescopic fork; 170 mm / 6.7 in travel (1981-82), 221 mm / 8.7 in (1983-84), 249 mm / 9.8 in (1985-86) |
| Rear Suspension | Swingarm with single remote-reservoir shock (Pro-Link from 1983); 109 mm / 4.3 in travel (1981-82), 206 mm / 8.1 in (1983-84), 249 mm / 9.8 in (1985-86) |
| Front Brakes | Hydraulic disc |
| Rear Brakes | Drum (1981); disc (1982-86) |
| DIMENSION SPECS | |
| Overall Length | 1895 mm / 74.6 in (1985-86) |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 737 mm / 29 in (1985-86) |
| Wheelbase | 1295 mm / 51 in (1985-86) |
| Ground Clearance | — |
| Dry Weight | 133 kg / 293 lbs (1985-86) |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 23.5 x 8-11 (1985-86) |
| Rear Tyre | 20 x 11-9 (1985-86) |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | Over 113 km/h / 70 mph (1985-86) |
The ATC250R was a racing-focused three-wheeler, swapping Honda's usual four-stroke for a 248 cc two-stroke with suspension at both ends. It was developed every two years: Pro-Link rear suspension and more travel arrived in 1983, and the 1985-86 model got a liquid-cooled engine, a sixth gear, a new frame and nearly 10 in of travel front and rear. It dominated three-wheeler racing until the category was killed off by safety concerns.
