AV89 and CDI Le party (no replies)

Moped brothers !

I have upgraded my 1967 AV89 to 12V with the CDI Le party from Treatland.
However, I am not able to attach the flywheel to the stock crankshaft. It seems to short for the flywheel nut. It leaves no clearance between the flywheel and the strator plate.

Anyone has any idea what I am talking about ?

Thanks!