The Yamaha XJ550 Seca is a four-stroke, transverse four-cylinder motorcycle that was produced in 1981. It has 528cc and 2 valves per cylinder with a compression ratio of 9.5:1. It uses 4x 28mm Mikuni carburetors and has battery-powered inductive ignition. The bike can produce a max power of 37 kW / 50 PS at 9000 rpm and a max torque of 41.9 Nm / 4,3 m-kg at 7500 rpm. It features a 6-speed transmission and a chain final drive. The bike has telescopic coil spring forks in the front and a swinging arm with dual dampers that are adjustable for preload in the rear. The front brakes are dual 267mm discs while the rear brake is a 182mm drum. The bike weighs 205 kg / 450 lbs and has a fuel capacity of 15 liters / 3.9 US gal. It has an average fuel consumption of 55 mpg, can do a standing 1/4 mile in 13.4 seconds at 98 mph and has a top speed of 178.6 km/h / 111 mph.
Technical specifications:
Make Model: Yamaha XJ 550R Sega
| Year | 1981 |
|---|---|
| Engine | Four stroke, transverse four cylinder. DOHC, 2 valves per cylinder. |
| Capacity | 528 cc / 32.2 cu-in |
| Bore x Stroke | 57 X 51.8 mm |
| Cooling System | Air cooled |
| Compression Ratio | 9.5:1 |
| Induction | 4x 28mm Mikuni carburetors |
| Ignition | Battery powered inductive |
| Starting | Electric |
| Max Power | 37 kW / 50 PS @ 9000 rpm |
| Max Torque | 41.9 Nm / 4,3 m-kg @ 7500 rpm |
| Transmission | 6 Speed |
| Final Drive | Chain |
| Front Suspension | Telescopic coil spring forks |
| Front Wheel Travel | 137 mm / 5.3 in |
| Rear Suspension | Swinging arm with dual dampers adjustable for preload |
| Rear Wheel Travel | 80 mm / 3.7 in |
| Front Brakes | 2x 267mm discs |
| Rear Brakes | 182mm Drum |
| Front Tyre | 3.25-19 |
| Rear Tyre | 110/ 90-16 |
| Wet Weight | 205 kg / 450 lbs |
| Fuel Capacity | 15 liters / 3.9 US gal |
| Consumption Average | 55 mpg |
| Standing 1/4 Mile | 13.4 sec / 98 mph |
| Top Speed | 178.6 km/h / 111 mph |
