Motocross Bikes
2025KTM 50 SX Factory
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The 2025 KTM 50 SX Factory is a lightweight minibike designed for young and beginner riders learning off-road skills. Powered by a nimble 49cc two-stroke engine with automatic transmission, it delivers approachable performance and easy handling. Known for its factory-quality engineering and durable chrome-molybdenum frame, this machine excels in motocross training and recreational riding.
- Capacity
- 49.9 ccm
- Engine
- Single, two-stroke
- Gearbox
- Not on record
Know it? Add it → - Dry weight
- 43.5 kg
- Seat height
- 653 mm
- Power
- 5.4 HP (4.0 kW)
What’s new for the 2025 KTM 50 SX Factory
vs the 2024| Spec | 2024 | 2025 |
|---|---|---|
| Rear suspension | XACT WP mono shock | XACT WP PDS mono shock |
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- It is a purpose-built entry-level motocross minibike designed to teach children the fundamentals of off-road riding in a controlled, race-oriented package.
- Built for
- The two-stroke engine, automatic centrifugal clutch, and factory-spec WP suspension give it a light, playful, eager-to-turn character suited to learning MX tracks.
- Not ideal for
- It is not suitable for adult riders, road use, touring, or carrying a passenger.
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
- 49.9 ccm
- Power
- 5.4 HP (4.0 kW)
- Engine type
- Single, two-stroke
- Power/weight ratio
- 0.1241 HP/kg (dry)
- Bore x stroke
- 39.5 x 40.0 mm
- Fuel system
- Carburettor
- Starting
- Kick
- Ignition
- Seletra 2p D36 EMS
Transmission
- Transmission type
- Automatic
- Final drive
- Chain
- Clutch
- Centrifugal
Dimensions & weight
- Wheelbase
- 1026 mm
- Seat height
- 653 mm
- Dry weight
- 43.5 kg
- Fuel capacity
- 2.30 litres
- Ground clearance
- 233 mm
Chassis & suspension
- Frame
- Chrome-molybdenum steel central-tube
- Front suspension
- XACT 35 WP Upside-Down fork, Ø 35 mm
- Rear suspension
- XACT WP PDS mono shock
- Front wheel travel
- 200 mm
- Rear wheel travel
- 190 mm
- Rake (fork angle)
- 24.0°
Brakes & wheels
- Front brakes
- Single disc
- Front brakes diameter
- 160 mm
- Rear brakes
- Single disc
Other
- Color options
- Orange/black/grey
- Comments
- Intended for children 4-10 years old. Special Factory Edition.
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 | 2024 | 2025 | 2026 |
|---|---|---|---|---|---|
| Capacity | 50 cc | 49 cc | 50 cc | 50 cc | 50 cc |
| Dry weight | 42 kg | 42 kg | 44 kg | 44 kg | 44 kg |
| Seat height | 665 mm | 665 mm | 653 mm | 653 mm | 653 mm |
| Fuel capacity | 2.3 L | 2.3 L | 2.3 L | 2.3 L | 2.3 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 50 SX Factory?
The 2025 KTM 50 SX Factory has a Capacity of 49.9 ccm (3.05 cubic inches).
What engine power does the KTM 50 SX Factory have?
The 2025 KTM 50 SX Factory has a Power of 5.4 HP (4.0 kW).
How much does the KTM 50 SX Factory weigh?
The 2025 KTM 50 SX Factory has a Dry weight of 43.5 kg (95.9 pounds).
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