Hi Rellio,
Wesh has described how to set the timing on a later Berg 99 to 03, the earlier ones are a bit different.
You will notice a small hole in the face of the flywheel and the cut out notch on the face of the stator, with a small drill bit aline these up and I think don't quote me on this but I think in degrees the piston wants to be 8 degrees BTDC.
But this is the way to set the ignition timing on this system, but double check the degrees BTDC before running the engine. Let us know how you get on.
Regards
Sparks.