Yamaha xj400 (1981)

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The Yamaha XJ 400 Special is a motorcycle produced in 1981. It has a four-stroke, transverse four-cylinder engine with a capacity of 398cc and a compression ratio of 9.7:1. The bike has 2x 34mm Mikuni carburetor induction and a battery-powered inductive ignition with an electric start. It has a maximum power of 45 hp / 32.8 kW @ 10000 rpm and a maximum torque of 3.5 kgf-m / 25 Nm @ 8000 rpm. The transmission is a six-speed with a final drive chain. The front suspension is a 35mm telescopic fork with a front wheel travel of 142mm / 5.6 in, while the rear suspension is a single shock with an adjustable spring preload and a rear wheel travel of 96mm / 3.8 in. The front brakes have a single disc with a 2-piston caliper, while the rear brakes are a drum. The bike has a front tire of 3.00-19 and a rear tire of 110 90-18. The dry weight is 176kg / 388lbs, and the fuel capacity is 15 liters / 3.9 US gal.

Technical specifications:

Make Model: Yamaha XJ 400 Special

Year: 1981


Engine: Four stroke, transverse four cylinder. DOHC
Capacity: 398 cc / 24.2 cu-in
Bore x Stroke: 51 48.8 mm
Cooling System: Air cooled
Compression Ratio: 9.7:1
Induction: 2x 34mm Mikuni carburetor
Ignition: Battery powered inductive
Starting: Electric
Max Power: 45 hp / 32.8 kW @ 10000 rpm
Max Torque: 3.5 kgf-m / 25 [email protected] 8000 rpm
Transmission: 6 Speed
Final Drive: Chain
Front Suspension: 35mm Telescopic forks
Front Wheel Travel: 142 mm / 5.6 in
Rear Suspension: Single shock, adjustable spring preload

Rear Wheel Travel: 96 mm / 3.8 in
Front Brakes: Single discs 2 piston caliper
Rear Brakes: Drum
Front Tyre: 3.00-19
Rear Tyre: 110 90-18
Dry Weight: 176 kg / 388 lbs
Fuel Capacity: 15 Litres / 3.9 US gal

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