| MODEL | YAMAHA XJ 550 SECA 1981 |
| Year | 1981 |
| Engine Type | Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder |
| Displacement / Capacity | 528 cc / 32.2 cu in |
| Bore X Stroke | 57 x 51.8 mm |
| Compression Ratio | 9.5:1 |
| Cooling System | Air cooled |
| Max Power | 37 kW / 50 PS @ 9000 rpm |
| Max Torque | 41.9 Nm / 4.3 kgf-m @ 7500 rpm |
| Ignition | Battery powered inductive |
| Induction | 4x 28 mm Mikuni carburettors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6 Speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic coil spring forks, 137 mm / 5.3 in travel |
| Rear Suspension | Swinging arm with dual dampers adjustable for preload, 80 mm / 3.7 in travel |
| Front Brakes | 2x 267 mm discs |
| Rear Brakes | 182 mm drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | 205 kg / 450 lbs |
| WHEEL SPECS | |
| Front Tyre | 3.25-19 |
| Rear Tyre | 110/90-16 |
| FUEL SYSTEM | |
| Fuel Capacity | 15 Litres / 3.9 US gal |
| Fuel Consumption | 55 mpg (average) |
| Top Speed | 178.6 km/h / 111 mph |
The Seca was the sports-styled XJ550, a compact air-cooled four that stayed mechanically unchanged over its life. Reviewers found its balanced handling and comfortable riding position appealing, while its quarter-mile times trailed rivals from Kawasaki, Honda and Suzuki.
