Aprilia RS125/Tuareg 125 flywheel
This is a flywheel for a Rotax 123 engine as fitted to Aprilia RS/125. Tuareg 125 and others. Its a rare part now.
It has a toothed ring so it is for the electric start version and not kickstart
Made by SEM and is part number 101 799 Type K
There is a crack on the magnets but this is still usable