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How to Replace the Piston on a TM Racing 125

Model: Tm Racing Tm Racing 125

Video tutorial

In this guide, we will see the instructions on how to disassemble and replace the piston and the entire cylinder assembly of the TM Racing 125. First, unscrew the head bolts, disconnecting the spark plug and the coil connector first; disconnect the coolant pipe from the radiator.

At this point, slide off the cylinder, giving you access to the piston; remove the circlip to extract the pin from the conrod, replacing the piston (or just replacing the rings).

Reassemble the cylinder assembly correctly, ensuring all components are lubricated.


Posted on 29 April 2026 by ScegliAuto


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