| MODEL | YAMAHA XJ 400 SECA 1980 - 1981 |
| Year | 1980 - 1981 |
| Engine Type | Four stroke, transverse four cylinder, DOHC |
| Displacement / Capacity | 398 cc / 24.2 cu in |
| Bore X Stroke | 51 x 48.8 mm |
| Compression Ratio | 9.7:1 |
| Cooling System | Air cooled |
| Max Power | 32.8 kW / 45 hp @ 10000 rpm |
| Max Torque | 3.5 kgf-m / 25 lb-ft @ 8000 rpm |
| Ignition | Battery powered inductive |
| Induction | 2 x 34 mm Mikuni carburettors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6-speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | 35 mm telescopic forks, 142 mm / 5.6 in travel |
| Rear Suspension | Single shock, adjustable spring preload, 96 mm / 3.8 in travel |
| Front Brakes | Single disc, 1-piston caliper |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 176 kg / 388 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.00-19 |
| Rear Tyre | 110/90-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 15 Litres / 3.9 US gal |
| Fuel Consumption | — |
| Top Speed | 162.5 km/h / 101 mph |
The XJ400 Seca was an air-cooled, DOHC four-cylinder middleweight with chain final drive, a front disc and rear drum brake and a six-speed gearbox. Its 45 hp output gave it a quarter-mile time of about 14 seconds and a top speed of roughly 162 km/h.
