Description
The engine of the Piaggio automatic scooters from 125ccm is not directly bolted to the frame.
Between frame and engine is a so-called parallelogram.
The swing arm parallelogram provides for the vertical swing compensation of the almost horizontally installed engine. If the engine would be screwed directly into the frame, the engine vibrations of the 1st and 2nd order would be hard to bear (mirror trembling, tingling, numb feeling in the hands etc.). In addition, it decouples the frame from shocks caused by uneven ground.
The swing arm parallelogram is therefore indispensable, but often causes some displeasure when riding in a sporty manner. There are two things that must be distinguished:
CHECK WARNING
The engine swingarm has six bearing points and can therefore cause a lot of lateral play of the engine under normal wear. This gives the rear wheel its own steering radius, which makes the handling very unstable and imprecise.
If the engine can be moved significantly transverse to the longitudinal axis of the vehicle, the swing arm should be revised. This is a main focus of the inspector at the next general inspection.
We offer a complete revision kit for this.
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