Yamaha SR400 Engine and Transmission Technical Data
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Engine type - Number of cylinders |
Single cylinder, four-stroke |
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Engine details |
- |
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Fuel system |
Injection |
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Engine size - Displacement - Engine capacity |
399.00 ccm (24.35 cubic inches) |
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Bore x Stroke |
87.0 x 62.7 mm (3.4 x 2.5 inches) |
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Compression Ratio |
8.5:1 |
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Number of valves per cylinder |
2 |
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Camshaft Valvetrain Configuration |
Single Overhead Cams (SOHC) |
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Maximum power - Output - Horsepower |
22.93 HP (16.7 kW)) @ 6500 RPM |
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Maximum torque |
27.40 Nm (2.8 kgf-m or 20.2 ft.lbs) @ 3000 RPM |
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Engine Maximum RPM |
- |
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Cooling system |
Air |
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Lubrication system |
Wet-sump |
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Engine oil capacity |
2.40 litres (2.54 quarts) |
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Exhaust system |
- |
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Gearbox |
5-speed |
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Transmission type, final drive ratio |
Chain |
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Clutch type |
Wet, Multiple Disc |
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Driveline |
- |