Yamaha SR400 First Test
The Japanese magazine Auto-By tested the new Yamaha SR400. The carburetor has been replaced with a fuel injection to cut the emission. Other new parts are: new exhaust with a catalyser, lambda sensor and a fuel pump.
As a big pump would affect the tank shape, to avoid this a new solution has been used. The fuel tank feeds fuel to a small sub-tank which is placed under the left side panel containing the pump.
The final change is an air-injection system that cleans the exhaust.
When it comes to the ride, the bike hasn’t changed. The chassis might not be modern, has narrow seat and wide bars, but it still handles very well. It’s worth remembering to smooth corners and throttle opening to load the suspension gently in order to prevent wobbling.
Peak torque in SR400 is a bit lower whereas the torque curve is fatter and more liner so it accelerates quicker and has a better throttle response.
THE FACTS
Yamaha SR400 - £3780
Engine: 399cc, air-cooled 2v OHC four-stroke single. Five gears
Power: 25bhp
Torque: 20 lb-ft
Weight: 174kg
Seat height: 790mm
Fuel capacity: 12 litres