| MODEL | HONDA XR 600R 1991 |
| Year | 1991 |
| Engine Type | Four stroke, single cylinder, SOHC, 4 valve RFVC (Radial Four Valve Combustion Chamber) |
| Displacement / Capacity | 591 cc / 36.0 cu in |
| Bore X Stroke | 97 x 80 mm |
| Compression Ratio | 9.0:1 |
| Cooling System | Air cooled |
| Max Power | 33.5 kW / 46 hp @ 6000 rpm |
| Max Torque | 51.9 Nm / 38.2 lb-ft @ 5500 rpm |
| Ignition | Solid-state CDI |
| Induction | 39 mm PD type Keihin carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | Dry sump |
| Gear Box | 5 Speed |
| Clutch | — |
| Final Drive | #520 O-ring-sealed chain, 14T/48T |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | 43 mm air-adjustable leading-axle Showa cartridge fork, 8-position compression damping adjustment, 295 mm / 11.6 in travel |
| Rear Suspension | Pro-Link single Showa shock, spring preload, 20-position compression and 20-position rebound damping adjustment, 280 mm / 11.0 in travel |
| Front Brakes | Single 256 mm disc, 2 piston caliper |
| Rear Brakes | Single disc, 1 piston caliper |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 955 mm / 37.6 in |
| Wheelbase | 1455 mm / 57.3 in |
| Ground Clearance | 345.5 mm / 13.6 in |
| Dry Weight | 134 kg / 295.5 lbs |
| Wet Weight | 146 kg / 321.9 lbs |
| WHEEL SPECS | |
| Front Tyre | 80/100-21 |
| Rear Tyre | 110/100-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 10.5 Litres / 2.6 US gal |
| Fuel Consumption | — |
| Top Speed | 143.2 km/h / 89.0 mph |
Photo: Daniel Björklund, Public domain, via Wikimedia Commons
Photo: Rikita, CC BY-SA 3.0, via Wikimedia Commons
For 1991 the XR600R received a cartridge-type front fork and swapped its rear drum for a disc brake, the most notable chassis update of its life. The 591 cc air-cooled RFVC single was carried over, and Dirt Bike magazine's test of this version recorded a top speed of about 89 mph. From here the bike would change little for the rest of the decade.
