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To replace the piston on the Husqvarna SM 125, first open the coolant drain cap and collect it in a container. Next, remove the spark plug and loosen the hose clips. The next step is to disconnect the radiator hoses and the valve breather hoses: at this point, you can remove the valve mechanism cover and the mechanism itself, as shown in the video. After removing the fixing screws of the head and the corresponding gaskets, you can pull out the pin and take out the piston, replacing it with a new spare part.

Updated on 21 April 2026 by ScegliAuto

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