Yamaha RD400 Specifications
| Category | Details |
|---|---|
| Engine | 2-stroke, air-cooled parallel twin |
| Displacement | 398 cc |
| Bore x Stroke | 64 mm x 62 mm |
| Compression Ratio | 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) |
Yamaha RD400 Additional Specifications
- Oil Type: 2-stroke motorcycle oil (typically synthetic or mineral-based)
- Oil Capacity: Approximately 2.0 liters (around 2.1 US quarts) when changing oil and filter.
- Gear Ratios:
- 1st: 2.38
- 2nd: 1.71
- 3rd: 1.38
- 4th: 1.17
- 5th: 1.04
- 6th: 0.96
- Horsepower (BHP): 44 hp @ 7,500 rpm
- Torque: 39 Nm @ 6,500 rpm
- Compression Ratio: 6.4:1
- Ignition System: Capacitor Discharge Ignition (CDI)
- Fuel System: 2x Mikuni VM28SS carburetors
- Transmission: 6-speed constant mesh gearbox
- 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: Approximately 105 mph (169 km/h)
These specifications encompass additional technical details like gear ratios, oil type and capacity, horsepower, torque, and various other aspects of the Yamaha RD400 model.
Pros:
- Powerful Engine: The 2-stroke, air-cooled parallel-twin engine delivers impressive power output for its size.
- Agile Handling: Renowned for its nimble and responsive handling, making it enjoyable on winding roads.
- Iconic Design: Classic styling cues and a vintage appearance that appeal to motorcycle enthusiasts.
- Lightweight: Relatively light for its time, contributing to its maneuverability and performance.
- Collectibility: Holds significant value as a classic motorcycle, attracting collectors and enthusiasts.
Cons:
- Maintenance Intensive: Being a 2-stroke engine, it requires more frequent maintenance, including oil changes and spark plug replacements.
- Ride Comfort: Suspension might be considered firm, leading to a slightly stiffer ride quality.
- Braking System: Older models might have less advanced braking systems compared to modern motorcycles.
Yamaha RD350 vs. Yamaha RD400:
RD350:
- Engine: 347cc 2-stroke parallel-twin.
- Power: Around 39-40 horsepower.
- Weight: Approximately 150 kg (330 lbs) – 155 kg (342 lbs), varying slightly among different versions and models.
RD400:
- Engine: 398cc 2-stroke air-cooled parallel-twin.
- Power: About 44 horsepower.
- Weight: Approximately 164 kg (362 lbs).
Comparison:
- Engine Size: The RD400 had a larger engine capacity (398cc) compared to the RD350 (347cc), resulting in slightly more power.
- Weight: The RD400 was slightly heavier than the RD350, likely due to the larger engine and possibly additional components.
Both models were renowned for their agile handling and 2-stroke engine characteristics. The RD400 offered a bit more power and potentially a different riding feel due to its larger engine, but the RD350 was celebrated for its nimble nature and impressive performance in its own right.