Yamaha SR400SP (1983-87)

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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

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