Across the 1978 and 1979 model years, the Yamaha DT 400 MX motorcycle has a listed wet/running weight of 310.9 lb (141 kg).
Yamaha DT 400 MX weight overview
This sits in a fairly light weight range. That does not guarantee easy handling, but it reduces the sheer mass you have to manage at a stop.
Light Motorcycle
How heavy is the Yamaha DT 400 MX?
wet weight
Using a model-level wet weight comparison, the Yamaha DT 400 MX is heavier than about 70.6% of 68 Yamaha enduro/off-road 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 DT 400 MX weight & related specs
| Model years covered | 1978, 1979 |
|---|---|
| Wet / running weight | 310.9 lb (141 kg) |
| Engine displacement | 397 cc |
| Fuel capacity | 2.38 US gal (9 L) |
| Full-tank fuel weight (estimated) | 14.8 lb (6.7 kg) |
Weight changes by model year
Useful weight calculations
| Displacement per pound | 1.28 cc / lb |
|---|---|
| Weight per 100 cc | 78.3 lb / 100 cc |
| Fuel weight as % of bike weight | 4.8% |
What the weight numbers tell you
Yamaha DT 400 MX weight FAQ
How heavy is the Yamaha DT 400 MX ready to ride?
Listed ready-to-ride weight is 310.9 lb (141 kg). The year-specific section above shows which years use each figure where the supplied value changes.
Is the Yamaha DT 400 MX heavy compared with other Yamaha enduro/off-road motorcycles?
Relatively speaking, it is on the heavier side. The model sits near the 71st weight percentile in its Yamaha category, so it is heavier than most of the compatible comparison set.
Does the Yamaha DT 400 MX weight change by model year?
Not in the usable weight data on this page. Across the covered 1978-1979 years, the supplied weight figure remains the same where comparable values are available.
How much does the Yamaha DT 400 MX fuel weigh?
The listed tank capacity is 2.38 US gal (9 L). Using approximately 0.745 kg/L gasoline, a full tank is roughly 14.8 lb (6.7 kg). That is an estimate for fuel mass, not an official Yamaha curb-weight calculation.
How heavy is the Yamaha DT 400 MX with an average-size rider?
A 180 lb rider brings the simple bike-plus-rider total to roughly 490.9 lb (222.6 kg) using the representative wet/running figure. Gear and luggage would add more.
How large is the Yamaha DT 400 MX engine for its weight?
Engine displacement relative to bike weight is 1.28 cc per lb. It can help compare motorcycles from very different displacement classes without relying on cc alone.
Is the Yamaha DT 400 MX above or below the typical Yamaha enduro/off-road motorcycle weight?
The model sits about 37.5 lb (17 kg) heavier than the compatible median Yamaha enduro/off-road motorcycle weight used on this page.
Will the Yamaha DT 400 MX feel heavy at low speed?
It is most likely to feel heavy while stopped, backing up or on a slope rather than once settled at normal riding speed. Seat height and center of gravity matter a lot.
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.