Motocross Bikes
2013KTM 125 SX
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The 2013 KTM 125 SX is a lightweight two-stroke motocross bike engineered for young and intermediate riders developing their skills on the track. Its compact 125cc engine delivers sharp throttle response and agile handling through tight corners, while the liquid-cooled single-cylinder design ensures reliable performance. Known for its responsive powerband and nimble chassis, this machine excels in technical terrain and represents KTM's commitment to entry-level motocross racing.
- Capacity
- 124.8 ccm
- Engine
- Single, two-stroke
- Gearbox
- 6-speed
- Dry weight
- 90.8 kg
- Seat height
- 992 mm
- Power
- 15.0 HP (11.0 kW)
What’s new for the 2013 KTM 125 SX
vs the 2012| Spec | 2012 | 2013 |
|---|---|---|
| Front suspension | WPSuspension | WP Suspension Up Side Down 4860 MXMA CC |
| Rear suspension | WPSuspension | WP Suspension 5018 BAVP DCC |
| Front brakes | Single disc | Single disc. Four-piston calipers. |
| Rear brakes | Single disc | Single disc. Two-piston calipers. |
Other years
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2025
2026
2027
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built purely for closed-course motocross racing, it excels at jumps, berms, and rapid direction changes on dirt tracks rather than any street use.
- Built for
- Light, explosive, and razor-sharp in handling, it rewards aggressive riding with a peaky two-stroke power band and minimal weight to manage.
- Not ideal for
- It is not suitable for commuting, highway travel, passengers, or riders seeking comfort, storage, or a forgiving low-end power delivery.
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
- 124.8 ccm
- Power
- 15.0 HP (11.0 kW)
- Engine type
- Single, two-stroke
- Power/weight ratio
- 0.1652 HP/kg (dry)
- Bore x stroke
- 54.0 x 54.5 mm
- Cooling system
- Liquid
- Fuel system
- Carburettor
- Starting
- Kick
- Ignition
- Contactless, controlled, fully electronic ignition system with digital ignition timing adjustment, type Kokusan
- Lubrication system
- Mixture oil lubrication 1:40
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Wet multi-disc clutch / hydraulically operated
Dimensions & weight
- Wheelbase
- 1480 mm
- Seat height
- 992 mm
- Dry weight
- 90.8 kg
- Fuel capacity
- 7.50 litres
- Ground clearance
- 395 mm
Chassis & suspension
- Frame
- Central tube frame made of chrome molybdenum steel tubing
- Front suspension
- WP Suspension Up Side Down 4860 MXMA CC
- Rear suspension
- WP Suspension 5018 BAVP DCC
- Front wheel travel
- 300 mm
- Rear wheel travel
- 335 mm
- Rake (fork angle)
- 26.5°
- Trail
- 120 mm
Brakes & wheels
- Front brakes
- Single disc. Four-piston calipers.
- Front brakes diameter
- 220 mm
- Rear brakes
- Single disc. Two-piston calipers.
- Rear brakes diameter
- 210 mm
- Front tyre
- 80/100-21
- Rear tyre
- 100/90-19
Other
- Color options
- Orange/black
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 | 2003 | 2009 | 2013 | 2015 | 2020 | 2027 |
|---|---|---|---|---|---|---|
| Capacity | 125 cc | 125 cc | 125 cc | 125 cc | 125 cc | 125 cc |
| Dry weight | 94 kg | 91 kg | 91 kg | 91 kg | 88 kg | 92 kg |
| Seat height | 925 mm | 985 mm | 992 mm | 992 mm | 950 mm | 958 mm |
| Fuel capacity | 7.5 L | 8 L | 7.5 L | 7.5 L | 7.5 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 125 SX?
The 2013 KTM 125 SX has a Capacity of 124.8 ccm (7.62 cubic inches).
What engine power does the KTM 125 SX have?
The 2013 KTM 125 SX has a Power of 15.0 HP (11.0 kW).
How many gears does the KTM 125 SX have?
The 2013 KTM 125 SX has a Gearbox of 6-speed.
How much does the KTM 125 SX weigh?
The 2013 KTM 125 SX has a Dry weight of 90.8 kg (200.2 pounds).
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