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125 SX
125cc2-stroke1 cylLiquid-cooledElectric start
About the 125 SX
KTM's 125cc two-stroke motocross racer, the classic first full-size bike for teenage and amateur racers.
- Family
- 125–200 2-Strokes
- Model years
- 1992 – present
- Also known as
- KTM 125 SX, 125SX, KTM 125 SX Factory Edition
- Trims
- Factory Edition
13 sources
- motocrossactionmag.com › all-new-2023-ktm-fuel-injected-two-stro…
- bike-parts-ktm.com › 1995
- ktm.com › motocross
- ktm.com › motocross
- motorcycle.com › detail
- bike-parts-ktm.com › 125_MOTO
- bike-parts-ktm.com › 1994
- racerxonline.com › 2007-ktm-two-stroke-intro
- dirtbikemagazine.com › 2011-ktm-sx-models
- dirtbikemagazine.com › 2019-ktm-motocross-bikes
- ktm.com › 2-stroke
- dirtbikemagazine.com › ktm-motocross-bikes-for-2017
- dirtbiketest.com › first-look-2023-ktm-sx-xc-models
Generations
2023 – present
125 SXCurrentAll-new frame and engine with throttle-body fuel injection and electric start only.
- Engine
- 125cc
- Cooling
- Liquid-cooled
- Starter
- Electric start
- Gearbox
- 6-speed
- Fuel
- Fuel injection
2019 – 2022
125 SXAll-new chassis, 6-speed Pankl gearbox and narrower DS clutch.
- Engine
- 125cc
- Cooling
- Liquid-cooled
- Starter
- Kick start
- Gearbox
- 6-speed
- Fuel
- Carburettor
2016 – 2018
125 SXNew engine with new cases and cylinder, 4.4 lb lighter; revised frame.
- Engine
- 125cc
- Cooling
- Liquid-cooled
- Starter
- Kick start
- Gearbox
- 6-speed
- Fuel
- Carburettor
2011 – 2015
125 SXCompletely new chassis including frame, swingarm and bodywork.
- Engine
- 125cc
- Cooling
- Liquid-cooled
- Starter
- Kick start
- Gearbox
- 6-speed
- Fuel
- Carburettor
2007 – 2010
125 SXFully redesigned frame, swingarm, bodywork and a smaller, lighter cylinder and head.
- Engine
- 125cc
- Cooling
- Liquid-cooled
- Starter
- Kick start
- Gearbox
- 6-speed
- Fuel
- Carburettor
1992 – 2006
125 SXFirst of the 'modern' KTMs with the linkless PDS shock; details of this period are thin.
- Engine
- 125cc
- Cooling
- Liquid-cooled
- Starter
- Kick start
- Fuel
- Carburettor
Year specs
- Engine
- 125 cc
- Bore × stroke
- 54 × 54.5 mm
- Cooling
- Liquid-cooled
- Starter
- Electric start
- Gearbox
- 6-speed
- Fuel system
- Fuel injection
- Horsepower
- —
- Torque
- —
- Dry weight
- 92 kg
- Wet weight
- —
- Seat height
- 958 mm
- Ground clearance
- 359 mm
- Wheelbase
- 1493 mm
- Fuel capacity
- 7.2 L
- MSRP
- $8,449
ktm.com gives 92 kg without fuel (motorcycle.com: 92.4 kg); the maker's figure is used. engine_cc computed from the cited bore x stroke.
Gallery
No photos yet.