KTM 125 SX 2019

Engine & Exhaust

The latest version of the 125 SX engine is once again the most competitive and powerful engine in its class. With an outstanding power-to-weight ratio, low cost and overall simplicity, it is clear that 2-strokes will continue to have a successful future at KTM. The compact and durable 17.2 kg engine was developed using the latest KTM engineering know-how, resulting in broad power across the rev range. Its easy rideability and outstanding performance are benefits that equate to faster lap times and better results.



Crankcases and engine covers



Factory spark plug

150 Factory kit

Factory piston


Radiator fan




FMF Powercore 2 silencer

FMF Powercore 2.1 silencer

FMF Titan Powercore 2.1 silencer


Factory control cover

Outer clutch cover

Oil plug

The illustrated vehicles may vary in selected details from the production models and some illustrations feature optional equipment available at additional cost. All information concerning the scope of supply, appearance, services, dimensions and weights is non-binding and specified with the proviso that mistakes, printing, setting and typing errors may occur; such information is subject to change without notice. No rights may be derived from incorrect statements.