Due to the higher number of revolutions per minute and therefore
greater centrifugal forces created by performance enhanced motor set
ups, the OE PIAGGIO clutch baskets tend to open up at higher motor
speeds and fly apart with almost always disastrous results, in terms of
what occurs within your engines crankcase when the contents of the
clutch are distributed throughout the gearbox...To help prevent this
happening we have clutch baskets with outer reinforcement rings.
The ring itself is produced by sectioning pre welded tubing for added
strength and is then welded in position around the clutch basket. This
makes it almost impossible for the clutch basket to open up at high revs
and the clutch circlip, which holds the whole clutch cluster together,
remains in place.

We recommend slight modification to the clutch
plates before fitting to avoid them catching on the reinforcement ring.
Just simply take a small metal file and smooth them off a little!