Yamaha RD400F

Yamaha RD400F Specifications. Pros and Cons

Yamaha RD400F Specifications

Engine2-stroke, air-cooled parallel twin
Displacement398 cc
Bore x Stroke64 mm x 62 mm
Power44 hp @ 7,500 rpm
Torque39 Nm @ 6,500 rpm
Ignition SystemCDI (Capacitor Discharge Ignition)
Fuel System2x Mikuni VM28SS carburetors
Transmission6-speed constant mesh gearbox
Gear Ratios1st: 2.38, 2nd: 1.71, 3rd: 1.38, 4th: 1.17, 5th: 1.04, 6th: 0.96
Front SuspensionTelescopic forks with hydraulic damping
Rear SuspensionDual shocks with adjustable preload
Front BrakeSingle disc brake
Rear BrakeDrum brake
Wheelbase1,320 mm (52.0 inches)
Weight164 kg (362 lbs)
Top SpeedApprox. 105 mph (169 km/h)

Performance Chart (Example)

RPMPower (hp)Torque (Nm)

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


  1. Powerful Engine: The 2-stroke, air-cooled parallel twin engine delivers impressive power for its class.
  2. Agile Handling: Known for its nimble handling and responsiveness, making it enjoyable on twisty roads.
  3. Classic Styling: Iconic design and styling cues that reflect the era of its production.
  4. Lightweight: Relatively light for its time, contributing to its agility and maneuverability.
  5. Legendary Status: Holds a significant place in motorcycle history, appealing to collectors and enthusiasts.


  1. 2-Stroke Characteristics: Requires more maintenance due to the nature of 2-stroke engines, such as frequent oil and spark plug changes.
  2. Ride Comfort: Suspension and seat might be considered firm for longer rides.
  3. 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

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