The Yamaha SR400SP is a vintage motorcycle model produced from 1983 to 1987. It is powered by a four-stroke, single-cylinder engine with a capacity of 399cc and a compression ratio of 8.5:1. It uses an air cooling system with a dry sump lubrication system and has a BSR33 carburetor for induction. The bike can produce a maximum power of 27 hp at 7000 rpm and a maximum torque of 27.4 Nm at 6500 rpm. A wet, multiple disc clutch is coupled to a five-speed transmission with a final drive chain. The frame is made of steel double cradle and dual shocks make up the rear suspension. The front suspension is a telescopic fork with a front wheel travel of 150mm while the rear suspension has a front wheel travel of 111mm. The front brakes use a single disc while the rear brakes use a drum. The bike has 3.50-19 front tyres and 4.00-16 rear tyres, and the wheelbase measures 1410mm. The seat height is 790mm with a ground clearance of 130mm. The wet weight of the bike is 174kg with a fuel capacity of 12 litres.
Technical specifications:
Make Model: Yamaha SR 400
| Year | 1983 – 87 |
|---|---|
| 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 | Telescopic fork |
| Front Wheel Travel | 150 mm / 5.9 in |
| Rear Suspension | Dual shocks |
| Front Wheel Travel | 111 mm / 4.3 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 |
