Motocross Bikes
2021Yamaha YZ450FX
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The 2021 Yamaha YZ450 FX is a competition-focused enduro bike built for serious off-road riders seeking maximum performance and reliability. Its potent 450cc four-stroke engine with titanium valves and fuel injection delivers strong power delivery across varied terrain. Known for aggressive handling and championship-winning capability, this machine excels in technical cross-country and off-road competition environments.
- Capacity
- 449.7 ccm
- Engine
- Single, four-stroke
- Gearbox
- 5-speed
- Wet weight
- 115.2 kg
- Seat height
- 955 mm
- Power
- 45.0 HP (33.1 kW)
What’s new for the 2021 Yamaha YZ450FX
vs the 2020| Spec | 2020 | 2021 |
|---|---|---|
| Torque | — | 44.6 Nm (4.5 kgf-m or 32.9 ft.lbs) @ 7100 RPM |
| Seat height | 965 mm (38.0 inches) | 955 mm (37.6 inches) |
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built for enduro racing and technical trail riding rather than commuting or leisurely road use.
- Built for
- Explosive, high-revving, and razor-sharp in handling, rewarding aggressive, committed riding over technical terrain.
- Not ideal for
- Not a good fit for new riders, shorter riders, or anyone wanting a comfortable, low-maintenance road or touring machine.
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
- 449.7 ccm
- Power
- 45.0 HP (33.1 kW)
- Torque
- 44.6 Nm (4.5 kgf-m) @ 7100 RPM
- Engine type
- Single, four-stroke
- Power/weight ratio
- 0.3906 HP/kg (wet)
- Bore x stroke
- 97.0 x 60.9 mm
- Compression
- 12.8:1
- Cooling system
- Liquid
- Fuel system
- Injection
- Starting
- Electric
- Ignition
- TCI
- Valves per cylinder
- 4
- Lubrication system
- Wet sump
Transmission
- Gearbox
- 5-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Wet multi-disc
Dimensions & weight
- Wheelbase
- 1481 mm
- Overall length
- 2174 mm
- Overall width
- 826 mm
- Overall height
- 1280 mm
- Seat height
- 955 mm
- Wet weight
- 115.2 kg
- Fuel capacity
- 8.30 litres
- Ground clearance
- 335 mm
- Dry weight
- Not on record - add it
Chassis & suspension
- Frame
- Aluminum Bilateral Beam frame
- Front suspension
- KYB® spring-type fork with speed sensitive damping; fully adjustable
- Rear suspension
- KYB® single shock; full adjustable
- Front wheel travel
- 310 mm
- Rear wheel travel
- 318 mm
- Rake (fork angle)
- 27.2°
- Trail
- 117 mm
Brakes & wheels
- Front brakes
- Single disc. Hydraulic
- Front brakes diameter
- 270 mm
- Rear brakes
- Single disc. Hydraulic
- Rear brakes diameter
- 245 mm
- Front tyre
- 80/100-21
- Rear tyre
- 120/90-18
Other
- Color options
- Team Yamaha Blue
- Comments
- Power Tuner app Torque is a rear-wheel dyno figure.
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 | 2016 | 2019 | 2021 | 2022 | 2024 | 2027 |
|---|---|---|---|---|---|---|
| Capacity | 450 cc | 450 cc | 450 cc | 450 cc | 450 cc | 450 cc |
| Seat height | 965 mm | 965 mm | 955 mm | 955 mm | 955 mm | 955 mm |
| Fuel capacity | 7.6 L | 8.3 L | 8.3 L | 8.3 L | 8.3 L | 7.9 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 YZ450FX?
The 2021 Yamaha YZ450FX has a Capacity of 449.7 ccm (27.44 cubic inches).
What engine power does the Yamaha YZ450FX have?
The 2021 Yamaha YZ450FX has a Power of 45.0 HP (33.1 kW).
How many gears does the Yamaha YZ450FX have?
The 2021 Yamaha YZ450FX has a Gearbox of 5-speed.
What is the torque of the Yamaha YZ450FX?
The 2021 Yamaha YZ450FX has a Torque of 44.6 Nm (4.5 kgf-m or 32.9 ft.lbs) @ 7100 RPM.
How much does the Yamaha YZ450FX weigh?
The 2021 Yamaha YZ450FX has a Wet weight of 115.2 kg (254.0 pounds).
Shop this bike
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The 2021 Yamaha YZ450 FX motorcycle is an impressive off-road machine that delivers power, agility, and durability. With a 450cc engine, this bike offers plenty of torque and acceleration for conquering tough trails and challenging terrain. The lightweight design and advanced suspension system make it easy to handle and control, while the electric start and smooth shifting transmission add convenience and performance. Whether you're a seasoned rider or a newcomer to off-road adventures, the YZ450 FX is a reliable and capable choice for tackling the great outdoors.
Overall, the 2021 Yamaha YZ450 FX motorcycle is a top-notch off-road bike that delivers power, agility, and durability. With a 450cc engine, this bike offers plenty of torque and acceleration for conquering tough trails and challenging terrain. The lightweight design and advanced suspension system make it easy to handle and control, while the electric start and smooth shifting transmission add convenience and performance. Whether you're a seasoned rider or a newcomer to off-road adventures, the YZ450 FX is a reliable and capable choice for tackling the great outdoors.
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