KTM 125 SX - 2014 Specifications and Reviews

The 2014 KTM 125 SX is a lightweight motocross bike designed for young and amateur riders seeking competitive performance. Powered by a nimble 125cc two-stroke engine with liquid cooling and electronic ignition, it delivers sharp acceleration and responsive handling on the track. Known for its aggressive styling and proven KTM reliability, the 125 SX remains a popular choice for stepping up through motocross racing classes.

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General information

CategoryCross / motocross
Year2014
ModelKTM 125 SX

Engine and Transmission Specifications

Driveline13:50. Primary drive: 23:73.
ClutchWet multi-disc clutch / hydraulically operated
Transmission type,final driveChain
Gearbox6-speed
Cooling systemLiquid
IgnitionContactless, controlled, fully electronic ignition system with digital ignition timing adjustment, type Kokusan
Fuel systemCarburettor
Bore x stroke54.0 x 54.5 mm (2.1 x 2.1 inches)
Engine detailsReed intake.
Engine typeSingle cylinder, two-stroke
Capacity:124.80 ccm (7.62 cubic inches)
 
 

Brakes, suspension, Frame and wheels

Rear brakes diameter220 mm (8.7 inches)
Rear brakesSingle disc. Brake calipers on floating bearings
Front brakes diameter260 mm (10.2 inches)
Front brakesSingle disc. Brake calipers on floating bearings
Rear suspension travel317 mm (12.5 inches)
Rear suspensionWP  Suspension 5018 BAVP DCC
Front suspension travel300 mm (11.8 inches)
Front suspensionWP  Suspension Up Side Down 4860 MXMA CC
Rake (fork angle)26.5°
Frame typeCentral tube frame made of chrome molybdenum steel tubing
 
 

Physical measures and capacities

Fuel capacity7.50 litres (1.98 gallons)
Wheelbase1,480 mm (58.3 inches)
Ground clearance395 mm (15.6 inches)
Seat height992 mm (39.1 inches) If adjustable, lowest setting.
Dry weight90.8 kg (200.2 pounds)

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay
Color optionsOrange/black
StarterKick

Performance Profile & Rider Fit

Best For

Track95%
City10%
Cornering90%
Daily Riding10%
Touring8%
Passenger5%

Rider Profile

Best ForThis is a full-on motocross competition bike best suited to intermediate through expert off-road riders, not beginners or casual road riders.
PurposeBuilt purely for closed-course motocross racing, it excels at jumps, berms, and rapid direction changes on dirt tracks rather than any street use.
Rider FitThe tall 958 mm seat height, aggressive ergonomics, and demanding 2-stroke power delivery require good rider fitness, strength, and prior dirt bike experience.
CharacterLight, explosive, and razor-sharp in handling, it rewards aggressive riding with a peaky two-stroke power band and minimal weight to manage.
Not Ideal ForIt is not suitable for commuting, highway travel, passengers, or riders seeking comfort, storage, or a forgiving low-end power delivery.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2014 KTM 125 SX Rider Ergonomics Assessment

Calculated in your browser only - your height/inseam are never sent to our servers.

Feet:

At 992mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with cannot reach comfortably on the 2014 KTM 125 SX, with a moderate knee angle of around 90 degrees and an upright riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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