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Nut for 13mm spanner, on PIAGGIO CIAO crankshafts.
Nut M8 X 1.25mm for variator, clutch, crankshaft from PIAGGIO CIAO. Tighten with a 13 mm wrench / socket.
Also arises on the high engines of HONDA MT, MB, MTX 50 ... Certain VESPA T5 ...