KTM 125 SX - 2008 Specifications and Reviews

The 2008 KTM 125 SX is a lightweight two-stroke enduro bike designed for young riders and beginners entering competitive off-road racing. Its compact 125cc single-cylinder engine and 90.8kg dry weight deliver agile handling and quick acceleration ideal for motocross and trail riding. The bike is renowned for its reliable Keihin carburetor setup and hydraulic clutch, making it a popular choice for junior riders developing fundamental dirt bike skills.

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General information

CategoryEnduro / offroad
Year2008
ModelKTM 125 SX

Engine and Transmission Specifications

ClutchWet multi-disc clutch, operated hydraulically
Gearbox6-speed
Cooling systemLiquid
Lubrication systemMixture oil lubrication 1:40
StarterKick
IgnitionKokusan digital magneto CDI
Fuel systemCarburettor. Keihin PWK 39
Bore x stroke54.0 x 54.5 mm (2.1 x 2.1 inches)
Stroke2
Engine typeSingle cylinder
Capacity:124.80 ccm (7.62 cubic inches)
 
 

Physical measures and capacities

Wheelbase1,471 mm (57.9 inches)
Ground clearance390 mm (15.4 inches)
Seat height960 mm (37.8 inches) If adjustable, lowest setting.
Dry weight90.8 kg (200.2 pounds)
 
 

KTM 125 SX dimensions and frame

Exhaust systemAluminium
Rear brakes diameter220 mm (8.7 inches)
Rear brakesSingle disc
Front brakes diameter260 mm (10.2 inches)
Front brakesSingle disc
Rear tyre dimensions100/90-19
Front tyre dimensions80/100-21
Rear suspension travel335 mm (13.2 inches)
Rear suspensionWP monoshock PDS
Front suspension travel300 mm (11.8 inches)
Front suspensionWP USD 43 mm (1.69
Rake (fork angle)27.0°
Frame typeCentral double-cradle-type 25CrMo4

Speed and acceleration

Fuel capacity7.50 litres (1.98 gallons)

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay

Rider Fit Visualizer

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Feet:

At 960mm, a rider of 68.9" with a 31" (estimated) inseam will reach the ground with cannot reach comfortably on the 2008 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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