Naked Motorcycles
2020Yamaha Byson FI
34 fields on record
The 2020 Yamaha Byson FI is a fuel-injected 155cc street bike sold in Asian markets. Its air-cooled 155cc four-stroke single makes 12.9 hp at 8,000 rpm and 13 Nm through a chain final drive. A 790 mm seat, 133 kg wet weight and 12-litre tank make it a practical daily ride.
- Capacity
- 155.0 ccm
- Engine
- Single, four-stroke
- Gearbox
- 5-speed
- Wet weight
- 133.0 kg
- Seat height
- 790 mm
- Power
- 12.9 HP (9.4 kW) @ 8000 RPM
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- It's built primarily as a lightweight, affordable commuter naked bike for city streets rather than performance riding.
- Built for
- The Byson FI has a simple, no-frills, muscular-looking naked bike character with modest single-cylinder performance.
- Not ideal for
- This is not the bike for riders seeking highway touring comfort, high top speed, or serious off-road capability.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usEngine
- Capacity
- 155.0 ccm
- Power
- 12.9 HP (9.4 kW) @ 8000 RPM
- Torque
- 13.0 Nm (1.3 kgf-m) @ 6000 RPM
- Engine type
- Single, four-stroke
- Power/weight ratio
- 0.0970 HP/kg (wet)
- Bore x stroke
- 57.3 x 57.9 mm
- Compression
- 9.5:1
- Cooling system
- Air
- Fuel system
- Injection
- Starting
- Electric & kick
- Ignition
- TCI
- Valves per cylinder
- 2
- Lubrication system
- Wet
Transmission
- Gearbox
- 5-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Wet, manual clutch, multiplate
Dimensions & weight
- Wheelbase
- 1340 mm
- Overall length
- 1999 mm
- Overall width
- 780 mm
- Overall height
- 1045 mm
- Seat height
- 790 mm
- Wet weight
- 133.0 kg
- Fuel capacity
- 12.00 litres
- Ground clearance
- 170 mm
- Dry weight
- Not on record - add it
Chassis & suspension
- Frame
- Diamond
- Front suspension
- Telescopic
- Rear suspension
- Swing Arm
Brakes & wheels
- Front brakes
- Single disc
- Rear brakes
- Expanding brake (drum brake)
- Front tyre
- 100/80-M17
- Rear tyre
- 130/70-M17
Other
- Color options
- Grey, gray/red
Specs last verified against published sources: .
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 | 2017 | 2018 | 2019 | 2020 | 2021 |
|---|---|---|---|---|---|
| Capacity | 155 cc | 155 cc | 155 cc | 155 cc | 150 cc |
| Seat height | 790 mm | 790 mm | 790 mm | 790 mm | 790 mm |
| Fuel capacity | 12 L | 12 L | 12 L | 12 L | 12 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 Byson FI?
The 2020 Yamaha Byson FI has a Capacity of 155.0 ccm (9.46 cubic inches).
What engine power does the Yamaha Byson FI have?
The 2020 Yamaha Byson FI has a Power of 12.9 HP (9.4 kW) @ 8000 RPM.
How many gears does the Yamaha Byson FI have?
The 2020 Yamaha Byson FI has a Gearbox of 5-speed.
What is the torque of the Yamaha Byson FI?
The 2020 Yamaha Byson FI has a Torque of 13.0 Nm (1.3 kgf-m or 9.6 ft.lbs) @ 6000 RPM.
How much does the Yamaha Byson FI weigh?
The 2020 Yamaha Byson FI has a Wet weight of 133.0 kg (293.2 pounds).
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