KTM 125 SX 2018

Engine & Exhaust

The latest KTM 125 SX engine is the most powerful and most competitive engine in its class; a clear statement that KTM is keen on keeping 2-stroke technology at the forefront of development. The secret to their success is an outstanding power-to-weight ratio, low costs and simplicity. This 125cc ripper has been developed with the latest KTM engineering know-how and the most advanced technology available. The results: class-leading power across the rev range, while being extremely compact and ultra-light at a mere 17.2kg. Our work here is done; now it’s up to you to collect the trophies.

Engine & Exhaust

Crankcases and engine covers




Factory spark plug

Factory cylinder kit

Factory cylinder head combustion chamber insert

150 Factory kit

Factory cylinder head combustion chamber insert

Factory piston


Radiator hose

Foam rubber

Radiator protection sleeve

Radiator protection



FMF Fatty expansion chamber

FMF Powercore 2 silencer

Factory silencer

Factory expansion chamber

Akrapovič "Slip-on Line"

Expansion chamber guard


Factory control cover

Outer clutch cover

Oil plug

Water pump cover