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The cylinder-piston assembly is the heart of the scooter. It is through its action that the engine turns. However, a cylinder and a piston do not have an infinite lifespan and it may be necessary to replace them. This tutorial explains how to do this! Here is a tutorial on the assembly and disassembly of a top engine on a 139QMB/QMA bottom engine. To change the cylinder-piston kit, you will need a certain number of tools, a minimum of knowledge and a fair amount of willpower. To get to the essential tools, you will first need 8, 10, 12mm socket or pipe wrenches, a 9mm flat wrench, a cross-head screwdriver, needle-nose pliers or circlip pliers, and finally a cylinder piston in working order. Now that you are ready to start, make sure you work in a clean area where the floor is clear or covered by a sheet like here to avoid losing tools or objects, then start by disassembling the trunk and all the fairings hindering access to the cylinder. Thanks to Nicolas (boostycom.fr) Richiz9.0 smoothy75 alex-16 stratos2b Jeremi62 Mickaelb pistache alex17 pdigi Nadil Hââmas Gerald59 ******************************************************************* Blog: http://www.scooter-chinois-4t.com/ Facebook: / scooter.chinois.4t Shop: https://www.boostycom.fr/