Yamaha SR400 (1981-82)

The Yamaha SR400 is a motorcycle produced between 1981 and 1982. It is powered by a four-stroke, single-cylinder engine with a displacement of 399 cc, featuring SOHC and two valves per cylinder. The motorcycle has a compression ratio of 8.5:1 and a BSR33 carburetor. The ignition is CDI and it has a kick starting mechanism. The maximum power output is 27 horsepower at 7000 RPM and a maximum torque of 27.4 Newton-meters at 6500 RPM. The clutch is wet, multiple disc and the transmission is a 5 speed gearbox, which is chain driven. The motorcycle has a steel double cradle frame and a front suspension with a 35mm telescopic fork.

The front wheel travel is 150 mm while the rear suspension is designed with dual shocks and adjustable preload, with a travel of 105 mm. The front brake is a single disc while the rear brake is a drum. The front and rear tires have a size of 3.50-19 inches and 4.00-16 inches, respectively. The motorcycle has a unique 27 degree rake caster angle, which provides a sporty style and a trail of 111 mm.

With a wet weight of 174 kg, it has a fuel capacity of 12 litres. The motorcycle is equipped with a dry sump lubrication system and an air cooling system. With a seat height of 790 mm and a ground clearance of 130 mm, this motorcycle represents classic Japanese style and vintage design.

Technical specifications:

Make Model: Yamaha SR 400

Year: 1981 – 82
Engine: Four stroke, single cylinder, SOHC, 2 valves per cylinder.
Capacity: 399 cc / 24.3 cu-in
Bore x Stroke: 87 67.2 mm
Compression Ratio: 8.5:1
Cooling System: Air cooled
Oil Capacity: 2.4 Litres
Lubrication: Dry sump
Induction: BSR33 carburetor
Ignition: CDI
Starting: Kick
Max Power: 27 hp / 17.1 KW @ 7000 rpm
Max Torque: 27.4 Nm / 6.3 kgf-m @ 6500 rpm
Clutch: Wet, Multiple Disc
Transmission: 5 Speed
Final Drive: Chain
Frame: Steel Double Cradle
Front Suspension: 35mm Telescopic fork
Front Wheel Travel: 150 mm / 5.9 in
Rear Suspension: Dual shocks, 5-way adjustable preload
Front Wheel Travel: 105 mm / 4.1 in
Front Brakes: Single disc
Rear Brakes: Drum
Front Tyre: 3.50-19
Rear Tyre: 4.00-16
Rake Caster Angle: 27 o
Trail: 111 mm / 4.4 in
Wheelbase: 1410 mm / 55.5 IN
Seat Height: 790 mm / 30.9 in
Ground Clearance: 130 mm / 5.1 in
Wet Weight: 174 kg / 384 lbs
Fuel Capacity: 12 Litres / 3.2 gal