Across the 1978 and 1979 model years, the Yamaha RD 400 motorcycle has a listed wet/running weight of 385.8 lb (175 kg).
Yamaha RD 400 weight overview
The bike falls into a normal middleweight range. At road speed the mass is usually less obvious; parking, slopes and walking-speed maneuvers are where you notice it most.
Middleweight Motorcycle
How heavy is the Yamaha RD 400?
wet weight
Using a model-level wet weight comparison, the Yamaha RD 400 is heavier than about 57.4% of 34 Yamaha classic motorcycles with compatible weight data.
Ready-to-ride weight
Bike + rider total weight
These totals use the model’s representative wet weight. They exclude riding gear, luggage and a passenger.
Yamaha RD 400 weight & related specs
| Model years covered | 1978, 1979 |
|---|---|
| Wet / running weight | 385.8 lb (175 kg) |
| Engine displacement | 399 cc |
| Fuel capacity | 4.36 US gal (16.5 L) |
| Full-tank fuel weight (estimated) | 27.1 lb (12.3 kg) |
Weight changes by model year
Useful weight calculations
| Displacement per pound | 1.03 cc / lb |
|---|---|
| Weight per 100 cc | 96.7 lb / 100 cc |
| Fuel weight as % of bike weight | 7% |
What the weight numbers tell you
Yamaha RD 400 weight FAQ
What is the Yamaha RD 400 wet weight?
The supplied wet/running weight is 385.8 lb (175 kg) across the model years covered here. That figure is the most useful available number for real-world handling because operating fluids and fuel are included.
Is the Yamaha RD 400 lighter or heavier than other Yamaha classic motorcycles?
Weight is broadly typical for the category, landing around the 57th percentile in this model-level Yamaha comparison.
Which Yamaha RD 400 years have different weight specs?
No clear weight change appears in the usable model-year data. Other specifications may still differ by year.
How much does a full tank add to the Yamaha RD 400?
Based on the supplied 4.36 US gal (16.5 L) tank capacity, the gasoline itself weighs about 27.1 lb (12.3 kg) when full. On models with a wet/running weight, that fuel mass is already included in the listed ready-to-ride figure.
What is the combined Yamaha RD 400 and rider weight?
Using the model’s representative wet/running weight and a 180 lb rider, the combined bike-and-rider mass is about 565.8 lb (256.6 kg) before riding gear, luggage or a passenger.
What is the Yamaha RD 400 displacement per pound?
The available figures work out to 1.03 cc per lb. This is not a performance rating, but it is a useful way to compare engine size against total motorcycle mass.
What is the Yamaha RD 400 weight difference versus the category median?
Compared with the median Yamaha classic motorcycle weight of 375.9 lb (170.5 kg), the model is roughly 9.9 lb (4.5 kg) heavier.
Where will I notice the Yamaha RD 400 weight most?
Expect the weight to matter more off the throttle than at speed: garage movement, uneven footing and parking angle are the practical situations to think about.
Motorcycle specifications can vary by model year, market, equipment and the exact dry/curb-weight definition. Calculated fuel-weight and ratio figures on this page are estimates derived from the supplied specifications. Confirm critical figures in the owner’s manual or on the official Yamaha Motorsports website.