| MODEL | YAMAHA XS 400R SECA 1982 - 1983 |
| Year | 1982 - 1983 |
| Engine Type | Four stroke, parallel twin, DOHC, 2 valves per cylinder |
| Displacement / Capacity | 399 cc / 24.3 cu in |
| Bore X Stroke | 69.0 x 53.4 mm |
| Compression Ratio | 9.7:1 |
| Cooling System | Air cooled |
| Max Power | 34 kW / 45.5 hp @ 9500 rpm |
| Max Torque | 3.5 kgf-m / 25.3 lb-ft @ 8000 rpm |
| Ignition | Transistorized |
| Induction | 2x 32 mm Mikuni carburettors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 6 speed |
| Clutch | Wet multiplate |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Pressed steel spine, engine as stressed member |
| Front Suspension | Hydraulic telescopic forks, 138 mm / 5.5 in travel |
| Rear Suspension | Monocross, single coil-sprung gas/oil shock, preload adjustable, 96.5 mm / 3.8 in travel |
| Front Brakes | 2x discs |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 169 kg / 372.9 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.00-18 |
| Rear Tyre | 4.10-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 18 Litres / 4.7 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The sporty XS 400R Seca, effectively the successor to the two-stroke RD400 in Yamaha's range, with a new DOHC twin that had a gear-driven balancer and Yamaha's induction control system. Testers found it light, quick to steer and economical, though the soft suspension limited hard riding.
