Yamaha SR400

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'Yamaha SR400'
Manufacturer
[[Yamaha]]
Also called SR400 WrenchMonkees GibbonSlap, SR400 35-years, SR 400 35-years, SR400 B.S.R, SR400 Stallion and Bronco, SR400 Lightening by Deus, SR400 Homage by Benders, SR400 Gibbonslap, SR400 Yard Built by Krugger, SR 400
Production 1978 - 2019
Class [[:Category:Road motorcycles|Road]] [[Category:Road motorcycles]]
Engine
single cylinder, four-stroke
Bore / Stroke 87.0mm x 62.7mm
Compression ratio 8.5:1
Horsepower 22.4 HP (16.7 KW) @ 6500RPM
Torque 20.21 ft/lbs (27.4 Nm) @ 3000RPM
Ignition tci: transistor controlled ignition
Battery 8.5:1
Transmission Gear box: 5-speed

Final Drive: chain

Clutch: wet, multiple disc
Suspension Front: telescopic
Rear: swdual shock swingarm
Brakes Front: single disc. hydraulic.
Rear: expanding brake (drum brake)
Front Tire 90/100-18
Rear Tire 110/90-18
Wheelbase 55.51 inches (1410 mm)
Length 82.09 inches (2085 mm)
Width 29.53 inches (750 mm)
Height 43.11 inches (1095 mm)
Seat Height 30.91 inches (785 mm)
Weight 335.1 pounds (152.0 Kg) (dry), 174.0 kg (wet)
Oil Capacity 0.63 Gallon (2.40 Liters)
Oil Filter K&N KN-145
Recommended Oil Yamalube 10W-40
Fuel Capacity 3.17 Gallon (12.00 Liters)
Fuel Consumption 3.56 liters/100 km (28.1 km/l or 66.07 mpg)
Manuals Service Manual


The Yamaha SR400 was a single cylinder, four-stroke Naked motorcycle produced by Yamaha between 1978 and 2019. Max torque was 20.21 ft/lbs (27.4 Nm) @ 3000 RPM. Claimed horsepower was 22.4 HP (16.7 KW) @ 6500 RPM.

Engine

The engine was a air cooled single cylinder, four-stroke. A 87.0mm bore x 62.7mm stroke result in a displacement of just 399.0 cubic centimeters. Fuel was supplied via a single overhead cams (sohc).

Drive

The bike has a 5-speed transmission. Power was moderated via the wet, multiple disc.

Chassis

It came with a 90/100-18 front tire and a 110/90-18 rear tire. Stopping was achieved via single disc. hydraulic. in the front and a expanding brake (drum brake) in the rear. The front suspension was a telescopic while the rear was equipped with a swdual shock swingarm. The SR400 was fitted with a 3.17 Gallon (12.00 Liters) fuel tank. The bike weighed just 335.1 pounds (152.0 Kg). The wheelbase was 55.51 inches (1410 mm) long.

1978 - 2002 Yamaha SR 400

1978 - 2002 Yamaha SR 400 1978 - 2002 Yamaha SR 400

The road sport models SR400 and SR500 were released in 1978, following in the steps of the XT500 which had the same single cylinder engine.




2002 - 2006 Yamaha SR 400

2002 - 2006 Yamaha SR 400 2002 - 2006 Yamaha SR 400 2002 - 2006 Yamaha SR 400 2002 - 2006 Yamaha SR 400 2002 - 2006 Yamaha SR 400

The 2002 SR 400 has a lower displacement, achieved with a different crankshaft and shorter piston stroke. The SR 400 was produced until 2008 and then reintroduced in 2010 with a fuel injection system in place of the 'old' carburetor.


2011 Yamaha SR 400

For 2010 Yamaha has replaced the carburetor with a fuel injection, a new exhaust with a catalyser and a new sensor bigger than before, and a fuel pump is required to pressurise the injector.


2012 - 2016 Yamaha SR 400

2012 - 2016 Yamaha SR 400 2012 - 2016 Yamaha SR 400 2012 - 2016 Yamaha SR 400 2012 - 2016 Yamaha SR 400 2012 - 2016 Yamaha SR 400

The 2012 Yamaha SR 400 is powered by a 399 cc, single-cylinder, air-cooled, SOHC, 2-valve engine that produces a torquey, “thumper” engine character that makes it an absolute blast to ride. Fuel injection gives the motor fantastic response and modern practicality.


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