101 - Octane has a wide assortment of quality and economical spare parts such as cylinder kits, V-belts, variators and seals. Good value and good value! Nut M10x1.25mm for the outer variomatic pulley. Fits all Peugeot engines and other scooters with M10x1.25 threads on the variator side of the crankshaft. It is an extra narrow nut, so that it does not jam with the starter clutch. OEM number for comparative purposes: 728042 .