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KTM 50 SX: a kids' motocross bike, versions and what to check
KTM 50 SX — the smallest KTM motocross bike, designed for kids starting out on the track. We look at how the versions differ, the age range it suits, and what to check when buying used.
50 SX in brief
50 SX — a motocross bike built for first steps on the track. It's lightweight, compact, and easy to handle, so many young motocross racers start with this one.
This bike is for training and kids' competitions, lacks road equipment, and isn't registered for road use.
Versions — how they differ
Previously, KTM offered several 50 SX versions, including some with a manual gearbox and clutch. Later versions mostly have an automatic gearbox, so kids only need to manage the throttle and brakes.
There were also “Mini” and larger models for different-sized kids. When choosing, consider the child's height, experience, and how easily they can reach the ground.
Engine and gearbox
The engine is a 50 cm³ two-stroke, liquid-cooled (in newer models), single-cylinder. Power is modest but sufficient for a small bike, and it's easy to manage.
Most newer 50 SX models have an automatic gearbox without a manual clutch, making learning easier. Check the specific differences between versions by year.
What to check when buying a used 50 SX
Most importantly, the engine condition and service history. Ask when the piston and other engine parts were last changed, and if there are any receipts.
Check the frame, suspension, wheel arches, timing belt, brakes, and plastic components. Look out for signs of rust, and before buying, start the engine and ensure it runs smoothly.
Trims
No trims available; we provide general variant descriptions.
50 SX (ankstesnė)
2000 onwardsEarlier versions, some with manual gearboxes.
- Often — cheaper
- Often — manual gearbox
- Requires more maintenance
50 SX (automatinė)
a few years' worth of versionsNewer version with automatic gearbox.
- Often — automatic gearbox
- Easier to learn
- Simple to drive
50 SX (varžybinis)
general descriptionOften prepared for racing.
- Often — parts that need replacing
- Worth checking the engine
- Worth checking the paperwork
Comparing variants
| Ankstesnė | Automatinė | Varžybinis | |
|---|---|---|---|
| Who it's for | Budget-friendly pick | For kids just starting out | For young rivals |
| Engine | 50 cm³, two-stroke | 50 cm³, two-stroke | 50 cm³, two-stroke |
| Gearbox | Depending on the version | Often — automatic | Depending on the version |
| Price in the used market (relatively) | € | €€ | €€ |
The automatic version is best for the youngest riders. When buying, check the engine hours and signs of wear.
Pros
- Light and easy to handle for kids
- Perfect for starting out in motocross
- Good selection of spare parts
- Newer versions come with an automatic transmission
Cons
- Not suitable for road use
- Two-stroke engines require maintenance
- Kids grow out of them quickly
Frequently asked questions
What age is the 50 SX suitable for?
Mostly for the youngest riders just starting out — the exact age depends on height and skills. Consult with a trainer or salesperson.
Does the 50 SX have a clutch?
Newer versions usually have an automatic transmission without a manual clutch, but older versions might have one. Check by year.
Can the 50 SX be ridden on roads?
No — it's a motocross bike without road-going equipment, designed for tracks.
Updated 2026-10-21 · Trim levels and equipment vary by market and model year — check the equipment of the specific car. · Translated automatically
