Naked Motorcycles
1981Yamaha XS 400
19 fields on record
The 1981 Yamaha XS 400 is a reliable middleweight twin perfect for novice and intermediate riders seeking an affordable, manageable motorcycle. Its air-cooled 392cc engine delivers modest power with excellent fuel efficiency, while the six-speed transmission and forgiving handling make it ideal for commuting and casual riding. Known for dependability and low maintenance costs, this Japanese machine earned respect as a practical entry-level bike.
- Capacity
- 392.0 ccm
- Engine
- Parallel Twin, four-stroke
- Gearbox
- 6-speed
- Wet weight
- 182.0 kg
- Seat height
- Not on record
Know it? Add it → - Power
- 27.0 HP (19.9 kW) @ 7000 RPM
What’s new for the 1981 Yamaha XS 400
vs the 1980| Spec | 1980 | 1981 |
|---|---|---|
| Power | 27.0 HP (19.9 kW) | 27.0 HP (19.9 kW) @ 7000 RPM |
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Best suited to relaxed commuting, weekend rides, and general around-town duties rather than performance riding.
- Built for
- An honest, unpretentious air-cooled twin with a classic Japanese UJM feel and modest, predictable performance.
- Not ideal for
- Not the right choice for riders seeking high-speed thrills, serious touring range, or any off-road capability.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Engine
- Capacity
- 392.0 ccm
- Power
- 27.0 HP (19.9 kW) @ 7000 RPM
- Engine type
- Parallel Twin, four-stroke
- Power/weight ratio
- 0.1484 HP/kg (wet)
- Bore x stroke
- 69.0 x 52.4 mm
- Compression
- 9.2:1
- Cooling system
- Air
- Valves per cylinder
- 2
- Torque
- Not on record - add it
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Chain
Performance
- Top speed
- 140.0 km/h (87.0 mph)
Dimensions & weight
Brakes & wheels
- Front brakes
- Single disc
- Rear brakes
- Expanding brake
- Front tyre
- 3.00-18
- Rear tyre
- 3.75-18
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 1980 | 1981 | 1982 |
|---|---|---|---|
| Capacity | 392 cc | 392 cc | 392 cc |
| Fuel capacity | 17 L | 17 L | 17 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the Yamaha XS 400?
The 1981 Yamaha XS 400 has a Capacity of 392.0 ccm (23.92 cubic inches).
What engine power does the Yamaha XS 400 have?
The 1981 Yamaha XS 400 has a Power of 27.0 HP (19.9 kW) @ 7000 RPM.
How many gears does the Yamaha XS 400 have?
The 1981 Yamaha XS 400 has a Gearbox of 6-speed.
How much does the Yamaha XS 400 weigh?
The 1981 Yamaha XS 400 has a Wet weight of 182.0 kg (401.2 pounds).
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