| MODEL | YAMAHA XJ 900R SECA 1984 |
| Year | 1984 |
| Engine Type | Air cooled, four stroke, transverse four cylinder, DOHC, 2 valves per cylinder |
| Displacement / Capacity | 853 cc / 52 cu in |
| Bore X Stroke | 67 x 60.5 mm |
| Compression Ratio | 9.2:1 |
| Cooling System | Air cooled |
| Max Power | 97 hp @ 9000 rpm |
| Max Torque | 80.2 Nm / 59.3 lb-ft @ 5000 rpm |
| Ignition | CDI |
| Induction | 4x 35 mm Mikuni carburettors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 Speed |
| Clutch | Wet, 5 springs |
| Final Drive | Shaft |
| CHASSIS SPECS | |
| Frame | Steel tubular |
| Front Suspension | Air assisted telescopic forks |
| Rear Suspension | Twin strut gas assisted, 5 spring preload and 12 damping adjustable |
| Front Brakes | 2x 254 mm discs |
| Rear Brakes | Single 254 mm disc |
| DIMENSION SPECS | |
| Overall Length | 2260 mm / 88.9 in |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 780 mm / 30.7 in |
| Wheelbase | 1480 mm / 58.2 in |
| Ground Clearance | 145 mm / 5.7 in |
| Dry Weight | — |
| Wet Weight | 244 kg / 537.9 lbs |
| WHEEL SPECS | |
| Front Tyre | 100/90-18 |
| Rear Tyre | 120/90-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 22 Litres / 5.8 US gal |
| Fuel Consumption | — |
| Top Speed | 213 km/h / 132.5 mph |
The 1984 Seca continued the shaft-drive, air-cooled four-cylinder XJ900 sports tourer. The listed figures are unchanged from the 1983 original, although other sources say Yamaha began revising the engine and forks around this time and added a belly pan. It remained a comfortable all-rounder rather than an out-and-out sports bike.
