Piaggio has with the introduction of the so-called PX Lusso models around 1984 also subjected...Continue reading
Piaggio has with the introduction of the so-called PX Lusso models around 1984 also subjected the gearboxes to a technical update. In addition to a newly designed main shaft (with grooves for better detent under load), this also includes a new type of shift cross (flat), a modified shift bolt (without washer) and the shift notch. This cannot be distinguished from the old type on the outside, but has a shift arm offset by 1.5mm. The position of the shift arm is decisive for the position of the shift cross in the transmission. If this is not the case, there will be a clacking idle and/or jumping gears (unless a wear of the shift cross or shift lever is responsible for it).
To check if you have a PX old (until 1984) or a PX Lusso shift lever in front of you, simply shift it to the position of 3 gears. Now it can be seen whether the slide shoe of the switching arm protrudes 1.5mm (= old PX) or whether it is flush with the sealing surface (= old PX Lusso). Due to the manufacturing process there are some dimensions in between. In order to compensate for this, the spacers offered here are used. It is also possible to use a PX old shift lever on a PX Lusso transmission.
The PX Lusso transmissions are still used today and have also been used in the Vespa T5, Cosa and LML models.
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