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Ktm
125 SX
Enduro · 125 cc
For sale now31 motorcycles
- Engine
- 125 cc
- Power
- 34 hp
- Weight
- 86 kg
- Price range
- €4,330 – €9,749
- Avg. mileage
- 53 km
- Common year
- 2024 · 15 motorcycles
This text was partly made with AI and may contain errors.
What should you pay for a 125 SX?
See typical prices, price changes and important differences.
What is a typical asking price?
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Based on asking prices, not sale prices. Trim, condition, maintenance and warranty still matter.
Price trend-23%
Based on price data from 5 of the past 12 months.
Used prices are trending down: the typical asking price is €1,875 lower than in May 2026.
Model family
125 SX at a glance
Quick reference values. Model year, generation and trim can differ.
Displacement
125 cc
Power
34 hp · 25 kW
Torque
25 Nm
Category
Enduro
Specifications
- Displacement
- 125 cc
- Power
- 34 hp · 25 kW
- Torque
- 25 Nm
- Weight
- 86 kg
- Seat height
- 935 mm
- Top speed
- 110 km/h
- Production
- 1993 – present
- Category
- Enduro
Comparable models
Also worth considering
Models in the same category and price range to consider alongside the 125 SX.
Generations and editions
Features and handling differ by generation. Use this overview to find the right version.
1 variants
Years
1993 - present
125 SX
GenerationThis technical reference row for the 125 SX combines the available catalogue data: 125 cc, 25 kW, 34 hp, 86 kg. It describes the model reference, but does not necessarily distinguish every production or equipment change. Always verify model year, trim and technical values against the individual motorcycle.
125 cc34 hp
About this model
About the Ktm 125 SX
The KTM 125 SX is a pure motocross bike for the 125 cc two-stroke class, for decades the entry-level choice for serious mx racers. Powered by a water-cooled single-cylinder two-stroke of 125 cc producing around 34 hp at a weight of just 86 kg, it delivers an exceptional power-to-weight ratio. KTM has produced the 125 SX since the early 1990s, refining engine character, suspension and ergonomics every year, the 2023 generation features a new frame and updated WP XACT fork.
The KTM 125 SX is built for the racetrack, not public roads. It targets young motocross riders and experienced racers competing in the lightweight 125 class. The high-revving power band demands skill and mechanical awareness; absolute beginners are better served by a 4-stroke trail bike. Direct competitors are the Yamaha YZ125 and Honda CR125R. On the used market, younger bikes with a documented service history are by far the safest buy.
- Category
- Enduro
- Production
- 1993 – present
- Power
- 34 hp
- Weight
- 86 kg
Before you buy
What to check before buying
- Check the top-end (piston, cylinder bore) for wear: a 125 cc two-stroke needs a top-end rebuild every 20–40 hours of use; always ask for the service log.
- Inspect the exhaust valve (RAVE) for carbon build-up and correct operation; a seized valve causes a significant power loss.
- Check the flywheel and ignition lead for damage from mud and stone impacts, which are common in motocross use.
- Verify the condition of the WP fork: sag setting, oil level and leaking seals; a full service is expensive.
- Look for bends or cracks in the frame, especially around the steering head and engine mounts; impact damage from hard crashes is not always visible externally.
Frequently asked questions
Frequently asked questions about the Ktm 125 SX
What does a used Ktm 125 SX cost?
A used Ktm 125 SX costs €6,450 on average. Most cost €4,330 to €9,749. This is based on 31 motorcycles for sale now.
How many used Ktm 125 SX are for sale?
MotorMonitor now compares 31 used Ktm 125 SX motorcycles from Dutch sales sites.
What year and mileage does an average used Ktm 125 SX have?
The average used Ktm 125 SX is from 2024 and has done about 53 km.