Model Name:SR400
Manufacturer:YAMAHA
Model Year:1978
YAMAHA had converted the engine of the XT500 in a road sports style and brought the first Japanese single sports model, SR, to the market. This is the 400cc version of the SR. Though the simple design is the same as that of 500, the initial 400 featured additional specifications like the tail cowl without a grab bar.
Specifications:
[Basic spec]
| Manufacturer | YAMAHA | Engine Type | Air-Cooled 4 Stroke OHC 2-Valve Single Cylinder |
|---|---|---|---|
| Model Name | SR400 | Starter | Kick Starter |
| Grade | - | Maximum Output (ps) | 27ps(20.0 kw)/7000rpm |
| Drive Train | - | Maximum Torque (kgf/m) | 3.0kg-m(29.4N-m)/6500rpm |
| Model Type | - | Curb Weight | 172 |
| Displacement | 399 | Dry Weight | 158 |
| Sales Launch Year | 1978/3 | Fuel Efficiency by Catalog | 41.0 km/L (at 60 km/h) |
| Height/Width/Length | 1095/-/- | Fuel Tank Capacity | 12 |
| Seat Height | 790 | Distance to Empty | - |
| Front Tire Indication | - | Fuel Supply | Carburetor |
| Rear Tire Indication | - |
[Service data]
| Standard Plug | BPR6ES | Chain Size | 530 |
|---|---|---|---|
| Number of Used Plugs | 1 | Chain Link Number | 106 |
| Engine Oil Amount | 2.4 | Battery Code | - |
| Engine Oil (Refill) | 2L | Headlight | - |
| Engine Oil (Element Replacement) | 2.1L | Headlight Type | - |
| Front Blinker Rating | 12V 21w | Headlight Remarks | - |
| Drive Sprocket Teeth Number | 16 | Tail Light Rating | 12V 21w/5w |
| Driven Sprocket Teeth Number | 47 | Rear Blinker Rating | 12V 21w |
[Machine detail]
| Motor Model Code | - | Caster Angle | 27.7 Degrees |
|---|---|---|---|
| Bore (mm) | 87 | Trail (mm) | 111 |
| Storke (mm) | 67.2 | Minimum Ground Clearance | - |
| Compression Ratio | 8.5 | Distance Between Axes | - |
| Ignition Method | C.D.I. | Streering Angle (Right) | - |
| Engine Lubrication Type | Compulsory Force Feeding Dry Sump | Turning Angle (Left) | - |
| Frame Type | Steel Pipe Semi Double Cradle | Mirror Screw Hole Diameter | 10mm |
| Minimum Rotaion Radius | 2.4 | Fuel Tank Reserve Capacity | - |
[Underbody detail]
| Front Brake Type | Single Disc | Suspension Type (Rear) | Swing Arm |
|---|---|---|---|
| Front Brake Remarks | - | Number of Rear Shock Absorbers | - |
| Rear Brake Type | Drum | Rear Suspension Stroke | - |
| Rear Brake Remarks | - | Rear Wheel Travel | - |
| Suspension Type (Front) | Telescopic | ABS | - |
| Front Fork Type | - | Drive Train | - |
| Front Suspension Stroke | - | Differential Oil Amount | - |
| Front Fork Diameter | - | Chain Remarks | - |
[Equipment]
| Seat Lowering Allowance | - | Theft Prevention Device | - |
|---|---|---|---|
| Mirror Screw Hole Diameter | 10mm | Tail Light Bulb Type | S25 |
| Mirror Remarks | Use screw type mirror or reverse screw adapter. | Tail Light Base Shape | BAY15D |
| Electronic Device Remarks | - | Tail Light Base Shape 2 | - |
| Fuel Gauge | - | Tail Light Remarks | Glass Shape G18 Also Installable |
| Clock | - | Front Blinker Bulb Type | S25 |
| Hazard | - | Front Blinker Base Shape | BA15S/BA15S |
[Engine detail]
| Clutch Type | - | Tappet Clearance (mm) EX | - |
|---|---|---|---|
| Transmission | - | Idling Initial Value (rpm) | - |
| Number of Gears | 5 | Needle Steps (Clip Location) | - |
| Gear Ratio | 2.357 / 1.555 / 1.190 / 0.916 / 0.777 | Float Level (mm) | - |
| Primary Reduction Ratio | 2.566 | Air Screw Return | - |
| Secondary Reduction Ratio | 2.947 | Main Jet Type | - |
| Variable Speed Vehicle Gear Ratio | - | Main Jet Number | - |
| Tappet Clearance (mm) IN | - |
[Other spec]
| Clutch Cable Length | 970 | Rear Brake Cable Length | - |
|---|---|---|---|
| Choke Cable Length | - | Other Cables | - |
| Meter Cable Length | - | Engine Number (Production Launch) | - |
| Throttle Cable Length | - | Engine Number (Production End) | - |
| Front Brake Cable Length | - |
[See Moto Index of YAMAHA]
[See Accessories for YAMAHA SR400]