Fits Zundapp, Kreidler, Sachs and Puch speedwind cooled models with motor rotation.
Our retarding circuit art.no 15325 is of course suitable for this system.
If you want 12V, you buy the volume regulator e.g. with art.no 14589
On fan-cooled Puch, adapter plate is needed for mounting the fan, see art.no 15576.
On Husqvarna Flinta (E-motor) the flywheel does not fit behind the generator cover, a spacer needs to be made to get the cover out.
On some two-speed hand-geared Sachs, it can be tight to get a Kokusan flywheel in.
Check that there is about 7mm margin outside your old flywheel if you want to be absolutely sure that it fits.
On engines where other details are mounted on the original flywheel, e.g. fan, magnapull, nozzle start or water pump, you will have to solve these yourself so that they can be driven, the flywheel does not have the same attachment points as an original Bosch flywheel.