KTM 125 SX - 2016 Specifications and Reviews

The 2016 KTM 125 SX is a lightweight two-stroke motocross bike designed for young riders and beginners entering competitive off-road racing. Known for its responsive handling and agile performance, the 125cc machine delivers sharp acceleration with minimal weight, making it ideal for learning fundamental motocross skills on tight tracks and technical terrain.

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General information

CategoryCross / motocross
Year2016
ModelKTM 125 SX

Engine and Transmission Specifications

Driveline13:50. Primary drive: 23:73.
ClutchMulti-plate clutch, Brembo hydraulics
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 wheel travel300 mm (11.8 inches)
Rear SuspensionWP shock absorber with linkage
Front wheel travel300 mm (11.8 inches)
Front SuspensionWP-USD, AER 48, Ø 48 mm
Rake (fork angle)26.5°
Frame typeChrome-molybdenum steel central-tube frame

Physical measures and capacities

Fuel capacity7.00 litres (1.85 gallons)
Wheelbase1,485 mm (58.5 inches)
Ground clearance375 mm (14.8 inches)
Seat height960 mm (37.8 inches) If adjustable, lowest setting.
Dry weight87.8 kg (193.6 pounds)

Other specs

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

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

2016 KTM 125 SX Rider Ergonomics Assessment

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

Feet:

At 960mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with cannot reach comfortably on the 2016 KTM 125 SX, with a cramped knee angle of around 85 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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