Piston pin MALOSSI 136 cc for art. n ° 31149300 / cc for art. n ° 31149300/31149290/31158290, for Vespa 90-125 / PV / ET3 / PK / S / XL / 2 15x09x45 mm, MK II direct intake / reed valve A new cylinder is not always the solution when the cylinder has several thousand I use kilometers. Get the level of compression back up where it belongs by replacing piston rings or pistons instead of burdening yourself with major repairs. Our warehouse is full of original spare parts and tuning and replacement parts such as pistons, piston rings, CIR clips, piston pins and gasket sets. Power transfer from the piston to the connecting rod is done by the piston pin. These are inserted into grooves on the inside of the piston. This groove is often a place for circlips / circlips (Seeger ring or ring), to prevent the pin from wandering outside. These should be replaced whenever the piston is refurbished or replaced. SIP-TIP: the right tools to make your simple cylinder work are: BU5045 piston ring pliers, Buzzetti pin installation / removal tool 15194000 and spindle snap ring 1782000. ### 23 4483 (MALOSSI)