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 |
