| MODEL | YAMAHA XJ 600 1984 - 1987 |
| Year | 1984 - 1987 |
| Engine Type | Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder |
| Displacement / Capacity | 598 cc / 36.5 cu in |
| Bore X Stroke | 58.5 x 55.7 mm |
| Compression Ratio | 10.0:1 |
| Cooling System | Air cooled |
| Max Power | 52.5 kW / 72 hp @ 10000 rpm |
| Max Torque | 53.9 Nm @ 8000 rpm |
| Ignition | CDI |
| Induction | 4x Mikuni BS32 carburettors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6 Speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic forks |
| Rear Suspension | Monocross rising rate with 5-way preload |
| Front Brakes | 2x 267 mm discs, 2 piston calipers |
| Rear Brakes | Single 267 mm disc, 1 piston caliper |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | 212 kg / 467.4 lbs |
| WHEEL SPECS | |
| Front Tyre | 90/90 V18 |
| Rear Tyre | 110/90 V18 |
| FUEL SYSTEM | |
| Fuel Capacity | 20 Litres / 5.3 US gal |
| Fuel Consumption | — |
| Top Speed | 205 km/h / 127 mph |
The XJ600 of 1984 (FJ600 in North America) was the first Japanese 600 cc inline four and among the first four-cylinder bikes with a monoshock rear. A lightweight air-cooled machine with a top-half fairing and about 72 hp, it was Yamaha's sporting middleweight until the Diversion replaced it in 1991.
