2009KTM 125 SX

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The 2009 KTM 125 SX is a lightweight enduro bike designed for younger riders and beginners seeking an accessible entry into off-road racing. Powered by a nimble 125cc liquid-cooled two-stroke engine with a 6-speed gearbox, it delivers sharp throttle response and excellent maneuverability. Known for its low seat height, minimal weight, and aggressive styling, the 125 SX excels in technical terrain and competitive amateur racing.

Capacity: 124.8 ccm
Engine: Single, two-stroke
Gearbox: 6-speed
Dry weight: 90.8 kg
Seat height: 985 mm
Power: 15.0 HP (11.0 kW)

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What’s new for the 2009 KTM 125 SX

vs the 2008

Spec	2008	2009
Seat height	960 mm (37.8 inches)	985 mm (38.8 inches)
Fuel capacity	7.50 litres (1.98 US gallons)	8.00 litres (2.11 US gallons)
Front suspension	WP USD 43 mm (1.69	WP USD, 43 mm
Rear suspension	WP monoshock PDS	WP PDS shock absorber

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

Off-road & trail96%

Cornering90%

City riding10%

Daily riding10%

Touring8%

Two-up5%

Track95%

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?

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Your height

Inseam (optional)

Units

At 985mm, a rider of 68.9" with a 31" (estimated) inseam will not reach the ground comfortably on the 2009 KTM 125 SX, with a moderate knee angle of around 90 degrees and an upright riding position.

Assumes about 30mm of suspension sag once seated. This is an approximation from category-typical geometry, not a measurement of this bike or of you - sit on one before you buy.

More bikes at over 900 mm — Sky High →

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Full specifications

Engine

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: Kokusan
Lubrication system: Mixture oil lubrication 1:40

Transmission

Gearbox: 6-speed
Transmission type: Manual
Final drive: Chain
Clutch: Wet multi-disc clutch, operated hydraulically

Dimensions & weight

Wheelbase: 1471 mm
Seat height: 985 mm
Dry weight: 90.8 kg
Fuel capacity: 8.00 litres
Ground clearance: 390 mm

Chassis & suspension

Frame: Central double-cradle-type 25CrMo4
Front suspension: WP USD, 43 mm
Rear suspension: WP PDS shock absorber
Front wheel travel: 300 mm
Rear wheel travel: 335 mm
Rake (fork angle): 27.0°
Trail: 120 mm

Brakes & wheels

Front brakes: Single disc
Front brakes diameter: 260 mm
Rear brakes: Single disc
Rear brakes diameter: 220 mm
Front tyre: 80/100-21
Rear tyre: 100/90-19

Other

Color options: Orange/black

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	2015	2020	2027
Capacity	125 cc	125 cc	125 cc	125 cc	125 cc
Dry weight	94 kg	91 kg	91 kg	88 kg	92 kg
Seat height	925 mm	985 mm	992 mm	950 mm	958 mm
Fuel capacity	7.5 L	8 L	7.5 L	7.5 L	7.2 L