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How to replace the piston on the KTM SX 125?

Model: Ktm Sx 125
Part: Checks and maintenance

Video tutorial

To replace the piston on the KTM SX 125, loosen the bolts that secure the seat and the side fairings at the front of the bike. Once these components are removed, you can unscrew the bolts that secure the front of the exhaust, removing it as well.

This will allow access to the top of the cylinder, which can be removed by unscrewing its screws. Underneath it, you will find the piston that needs to be removed from its connecting rod by eliminating its retaining ring.

This will allow you to install a new one and reassemble all the components that were removed earlier.


Updated on 3 July 2026 by ScegliAuto


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Watch the video!


by ScegliAuto

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