Yamaha RD400F Specifications
| Category | Details |
|---|---|
| Engine | 2-stroke, air-cooled parallel twin |
| Displacement | 398 cc |
| Bore x Stroke | 64 mm x 62 mm |
| Compression | 6.4:1 |
| Power | 44 hp @ 7,500 rpm |
| Torque | 39 Nm @ 6,500 rpm |
| Ignition System | CDI (Capacitor Discharge Ignition) |
| Fuel System | 2x Mikuni VM28SS carburetors |
| Transmission | 6-speed constant mesh gearbox |
| Gear Ratios | 1st: 2.38, 2nd: 1.71, 3rd: 1.38, 4th: 1.17, 5th: 1.04, 6th: 0.96 |
| Front Suspension | Telescopic forks with hydraulic damping |
| Rear Suspension | Dual shocks with adjustable preload |
| Front Brake | Single disc brake |
| Rear Brake | Drum brake |
| Wheelbase | 1,320 mm (52.0 inches) |
| Weight | 164 kg (362 lbs) |
| Top Speed | Approx. 105 mph (169 km/h) |
Performance Chart (Example)
| RPM | Power (hp) | Torque (Nm) |
|---|---|---|
| 3000 | 20 | 25 |
| 4000 | 30 | 30 |
| 5000 | 35 | 35 |
| 6000 | 40 | 38 |
| 7000 | 44 | 39 |
| 8000 | 43 | 38 |
| 9000 | 42 | 37 |
| 10000 | 40 | 35 |
Oil Type and Quantity
- Oil Type: 2-stroke motorcycle oil (typically synthetic or mineral-based)
- Quantity of Oil: The Yamaha RD400F typically requires around 2.0 liters (approximately 2.1 US quarts) of oil when changing the oil and filter.
Manufacturing Year
The Yamaha RD400F was manufactured from 1979 to 1980. These years represent the production period for the RD400F model.
Yamaha RD400F: Pros and Cons
Pros:
- Powerful Engine: The 2-stroke, air-cooled parallel twin engine delivers impressive power for its class.
- Agile Handling: Known for its nimble handling and responsiveness, making it enjoyable on twisty roads.
- Classic Styling: Iconic design and styling cues that reflect the era of its production.
- Lightweight: Relatively light for its time, contributing to its agility and maneuverability.
- Legendary Status: Holds a significant place in motorcycle history, appealing to collectors and enthusiasts.
Cons:
- 2-Stroke Characteristics: Requires more maintenance due to the nature of 2-stroke engines, such as frequent oil and spark plug changes.
- Ride Comfort: Suspension and seat might be considered firm for longer rides.
- Braking System: Older models might have less advanced braking systems compared to contemporary motorcycles.
Comparison with Other RD Models
When compared to other RD models like the RD350 or earlier RD400 versions, the RD400F often stands out due to its refinements and advancements:
RD400F vs. RD350:
- The RD400F featured a larger displacement engine (398cc) compared to the RD350 (347cc), providing slightly more power and torque.
- The RD400F typically had more modernized suspension and braking systems compared to some RD350 models.
- The RD400F might offer a bit more stability due to its slightly longer wheelbase.
RD400F vs. Earlier RD400 Models:
- The RD400F might have improved components and refinements over earlier RD400 versions, offering better handling and performance.
- Some earlier RD400 models might have a different styling or fewer updates in terms of features compared to the RD400F.
Each model has its unique characteristics and appeals to different riders based on preferences for power delivery, handling, and overall riding experience. The RD400F, however, often stands as a pinnacle of the RD series due to its enhancements and advancements