Yamaha XJ550 (1981)

The Yamaha XJ550 is a motorcycle model from 1981 with a four stroke, transverse four cylinder engine. It has a capacity of 528 cc and is cooled by air. It uses 4x 28mm Mikuni carburetors for induction and has a compression ratio of 9.5:1. The ignition is battery powered inductive and it starts electrically. The maximum power is 37 kW or 50 PS at 9000 rpm while the maximum torque is 41.9 Nm at 7500 rpm. It has a 6-speed transmission and a chain final drive. The front suspension is telescopic coil spring forks with a wheel travel of 137 mm, while the rear suspension has a swinging arm with dual dampers adjustable for preload and a wheel travel of 80 mm. The front brakes consist of 2x 267mm discs while the rear brakes are a 182mm drum. The front tire is 3.25-19 while the rear tire is 110/ 90-16. Its wet weight is 205 kg and it has a fuel capacity of 15 liters. Its consumption average is 55 mpg and it has a standing 1/4 mile time of 13.4 seconds with a top speed of 178.6 km/h or 111 mph.

Technical specifications:

Make Model: Yamaha XJ 550

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