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How to Replace the Piston on the TM Racing SMR 125?

Model: Tm Racing Smr 125
Part: Engine

Video tutorial

To replace the piston on the TM Racing SMR 125, you need to access the internal components of the engine: specifically, you will need to unscrew the bolts that secure the cylinder, which contains the piston. By unscrewing these bolts and disconnecting the connectors attached to the cylinder, you can remove it to access the piston: this can now be detached from its conrod by expanding and removing its circlip.

After the old piston has been removed, insert the new one and reinstall the cylinder on top of the engine.


Updated on 13 July 2026 by ScegliAuto


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To replace the piston on a Derbi GPR 125, loosen the bolts securing the cylinder head to its housing, allowing it to be removed along with the valve cover. This will enable you to access the bolts securing the cylinder at the top of the engine, allowing for its complete removal and revealing the underlying piston. The piston can now be freed from its securing bolts, enabling you to position the new piston onto the corresponding conrod. After installation, refit the engine components.

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by ScegliAuto

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