Motocross Bikes
2021KTM 450 SX-F Factory
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The 2021 KTM 450 SX-F Factory is a high-performance motocross machine built for competitive riders and serious enthusiasts seeking championship-level performance. Its potent 449cc liquid-cooled four-stroke engine delivers 63 horsepower with sharp throttle response and reliable power delivery across the RPM range. Known for exceptional handling, precision engineering, and Factory-spec components, it excels in professional racing and demanding off-road conditions.
- Capacity
- 449.3 ccm
- Engine
- Single, four-stroke
- Gearbox
- 4-speed
- Dry weight
- 100.5 kg
- Seat height
- 950 mm
- Power
- 63.0 HP (46.0 kW)
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- This is a purpose-built first motorcycle for young children learning to ride off-road, not a performance or touring machine.
- Built for
- A simple, forgiving automatic-clutch two-stroke minibike meant to teach balance, throttle control, and basic off-road riding skills.
- Not ideal for
- This bike is not suitable for adult riders, highway use, touring, or anyone seeking speed or long-distance comfort.
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
- 449.3 ccm
- Power
- 63.0 HP (46.0 kW)
- Engine type
- Single, four-stroke
- Power/weight ratio
- 0.6269 HP/kg (dry)
- Bore x stroke
- 95.0 x 63.4 mm
- Cooling system
- Liquid
- Fuel system
- Injection
- Starting
- Electric
- Ignition
- Keihin EMS
Transmission
- Gearbox
- 4-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Wet, DDS multi-disc clutch, Brembo hydraulics
Dimensions & weight
- Wheelbase
- 1485 mm
- Seat height
- 950 mm
- Dry weight
- 100.5 kg
- Fuel capacity
- 7.00 litres
- Ground clearance
- 370 mm
Chassis & suspension
- Frame
- 25CrMo4 steel central-tube
- Front suspension
- WP XACT-USD, Ø 48 mm
- Rear suspension
- WP XACT Monoshock with linkage
- Front wheel travel
- 310 mm
- Rear wheel travel
- 300 mm
- Rake (fork angle)
- 26.1°
Brakes & wheels
- Front brakes
- Single disc. Brake calipers on floating bearings
- Front brakes diameter
- 260 mm
- Rear brakes
- Single disc. Brake calipers on floating bearings
Other
- Color options
- Orange/white/black
- Comments
- Connectivity to a myKTM app
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 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|
| Capacity | 449 cc | 449 cc | 450 cc | 450 cc |
| Dry weight | 101 kg | 101 kg | 104 kg | 103 kg |
| Seat height | 950 mm | 950 mm | 958 mm | 958 mm |
| Fuel capacity | 7 L | 7 L | 7.2 L | 7.2 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 KTM 450 SX-F Factory?
The 2021 KTM 450 SX-F Factory has a Capacity of 449.3 ccm (27.42 cubic inches).
What engine power does the KTM 450 SX-F Factory have?
The 2021 KTM 450 SX-F Factory has a Power of 63.0 HP (46.0 kW).
How many gears does the KTM 450 SX-F Factory have?
The 2021 KTM 450 SX-F Factory has a Gearbox of 4-speed.
How much does the KTM 450 SX-F Factory weigh?
The 2021 KTM 450 SX-F Factory has a Dry weight of 100.5 kg (221.6 pounds).
Shop this bike
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The 2021 KTM 450 SX-F Factory is a powerhouse of a motorcycle that offers top-of-the-line performance and cutting-edge technology. With its powerful 450cc engine, lightweight frame, and advanced suspension system, this bike is designed to dominate the track. The Factory edition also comes equipped with premium components such as a carbon fiber subframe, reworked cylinder head, and a high-end WP XACT suspension system, providing riders with ultimate control and precision. Whether you're a seasoned racer or a weekend warrior, the 2021 KTM 450 SX-F Factory delivers a thrilling riding experience that is sure to excite any motocross enthusiast.
Overall, the 2021 KTM 450 SX-F Factory is a top-tier motorcycle that offers unparalleled performance and cutting-edge technology. With its powerful engine, lightweight construction, and premium components, this bike is designed to dominate the motocross track. Whether you're a competitive racer or simply enjoy hitting the trails on the weekends, the 2021 KTM 450 SX-F Factory is a top choice for riders who demand the best.
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