Nut used to fix the variomatic and the polar wheel to the 125-200cc two and four stroke engines of Piaggio and Gilera.
The special thing about this nut is its rotating collar.
Due to the reduced friction the tightening torque can be maintained more precisely and the mounting surface is not damaged by any locking washer.
TIP: Perfectly usable also on the engines of the PX, Cosa, T5 and PK XL, XL2 models!
(US)
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