Yamaha XS 400R (1982)

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The Yamaha XS 400R (1982) is a four-stroke, parallel-twin, DOHC motorcycle with a capacity of 399 cc. It has a maximum power of 45.5 hp at 9500 RPM and maximum torque of 3.5 kgf-m at 8000 RPM. The engine features 2 valves per cylinder and a compression ratio of 9.7:1. It has air cooling and uses wet sump lubrication with 2x 32mm Mikuni carburetors for induction. The ignition is transistorized and the starting is electric. The transmission has six speeds, and the final drive is a chain. The frame is made of pressed steel with the engine as a stressed member. The front suspension is hydraulic telescopic forks with a front wheel travel of 138 mm, while the rear suspension features the monocross system with pre-load adjustable single coil sprung, gas/oil damped shock, and a rear wheel travel of 96.5 mm. The front brake is a single 10.5-inch disc, and the rear brake is a drum. It has a wheelbase of 54.1 inches, a seat height of 30.9 inches, and a ground clearance of 5.9 inches. The dry weight is 366 lbs, and the fuel capacity is 17 litres or 4.4 US gallons.

Technical specifications:

Make Model: Yamaha XS 400 DOHC

Year: 1982 –


Engine: Four stroke, parallel twin, DOHC, 2 valves per cylinder
Capacity: 399 cc / 24.3 cu-in
Bore x Stroke: 69.0 x 53.4 mm
Cooling System: Air cooled
Compression Ratio: 9.7:1
Lubrication: Wet sump
Induction: 2x 32mm Mikuni carburetors
Ignition: Transistorized
Starting: Electric
Max Power: 45.5 hp / 34 kW @ 9500 rpm
Max Torque: 3.5 kgf-m / 25.3 lb-ft @ 8000 rpm
Clutch: Wet, multiplate
Transmission: 6 Speed
Final Drive: Chain
Frame: Pressed steel spine with engine as stressed member

Front Suspension: Hydraulic telescopic forks
Front Wheel Travel: 138 mm / 5.5 in
Rear Suspension: Monocross system with single coil sprung, gas/oil damped shock, pre-load adjustable
Rear Wheel Travel: 96.5 mm / 3.8 in
Front Brakes: Single 10.5 in disc
Rear Brakes: Drum
Front Tyre: 3.00-18
Rear Tyre: 4.10-18
Rake: 63 degrees
Trail: 95 mm / 3.74 in
Wheelbase: 54.1 in
Seat Height: 30.9 in
Ground Clearance: 5.9 in
Dry Weight: kg / 366 lbs
Fuel Capacity: 17 Litres / 4.4 US gal

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