Yamaha xs400 (1977-78)

Make Model: Yamaha XS 400


Year: 1977 – 78
Engine: Four stroke, 180 degrees parallel twin, SOHC, 2 valves per cylinder
Capacity: 392 cc / 23.9 cu-in
Bore x Stroke: 69.0 x 52.4 mm
Cooling System: Air cooled
Compression Ratio: 9.2:1
Lubrication: Pressure-lubricated wet sump
Induction: 2x Mikuni BS32 carburetors
Ignition: Battery ignition – With contact breaker points
Starting: Electric & kick
Max Power: 36 hp / 26.8 kW @ 8100 rpm
Max Torque: 3.3 kgf-m / 23.8 lb-ft @ 8000 rpm
Clutch: Wet multiplate
Transmission: 6 Speed
Final Drive: Chain
Frame: Tubular steel, semi-double cradle
Front Suspension: Telescopic fork
Rear Suspension: Dual shocks swing arm, preload adjustable
Front Brakes: Single disc
Rear Brakes: Drum
Front Tyre: 3.00-18

Rear Tyre: 3.50-18
Wheelbase: 1364 mm / 53.7 in
Seat Height: 780 mm / 30.7 in
Wet Weight: 182 kg / 401 lbs
Fuel Capacity: 14 Litres / 3.7 US gal


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