YZ400D
Category: Motocross
Manufacturer: Yamaha
Hits: 687
| Year | 1977 |
| Engine Class | 400 |
| VIN Prefix | 1W4 |
| Known VIN Range (Vehicle ID Numbers) | 000101--006720 |
| Tank Color(s) | Competition Yellow |
| Country of Sale | USA |
| Bore (MM) | 85 |
| Stroke (MM) | 70 |
| Displacement (CC) | 397 |
| Compression Ratio (to 1) | 7.59 |
| BHP @ RPM | 41 @ 7,500 |
| Torque (kgm) @ RPM | 4.05 @ 7,000 |
| Autolube Injection? | No |
| Engine Cooling | Air |
| Carburetor Model | VM38SS |
| Ignition Type | CDI (Electronic) |
| Ignition Timing MM (BTDC) | 2.7 |
| Primary Drive Gearing | 2.24 |
| Final Drive Gearing (Sprockets) | 50/14 |
| Box Gearing First | 2.29 |
| Box Gearing Second | 1.71 |
| Box Gearing Third | 1.3 |
| Box Gearing Fourth | 1.0 |
| Box Gearing Fifth | 0.84 |
| Fuel Capacity (L) | 8.0 |
| Gearbox Oil Capacity | 1.0 |
| Front Tire (stock) | 3.00 x 21 |
| Rear Tire (stock) | 5.00 x 18 |
| Front Brake Type | Drum |
| Rear Brake Type | Drum |
| Rear Suspension | Mono Shock |
| Front Suspension Travel (mm) | 215 |
| Rear Suspension Travel (mm) | 215 |
| Rake (degrees) | 30.5 |
| Trail (mm) | 134 |
| Overall Width (mm) | 838 |
| Ground Clearance (mm) | 285 |
| Wheelbase (mm) | 1,445 |
| Dry Weight (kg) | 102 |
| Voltage | 6 Volt |