Yamaha SR400SP (1979)

The Yamaha SR400SP motorcycle was produced in 1979 and is a four stroke, single cylinder engine with a capacity of 399 cc. Its compression ratio is 8.5:1 and it features air cooling, a BSR33 carburetor and a wet, multiple disc clutch. The transmission is a 5 speed chain drive and the frame is made of steel double cradle. The front suspension consists of a 35mm telescopic fork and the rear suspension is dual shocks with 5-way adjustable preload. The front wheel travel is 150 mm and the rear wheel travel is 105 mm. The motorcycle has a single disc front brake and drum rear brake with a wheelbase of 1410 mm and a seat height of 790 mm. The fuel capacity is 12 litres and wet weight is 174 kg. The Yamaha SR400SP has a maximum power of 27 hp (17.1 KW) at 7000 rpm and a maximum torque of 27.4 Nm (6.3 kgf-m) at 6500 rpm. It has a front tyre size of 3.50-19 and a rear tyre size of 4.00-16 with a rake caster angle of 27 o and a trail of 111 mm. The ground clearance is 130 mm.

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Technical specifications:

Make Model: Yamaha SR 400SP

Year: 1979

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