My experiences with by 2ndG 1200:
Both covers have a gasket which is glued in place and should be replaced.
I don't recall anything tricky inside the Signal Generator Cover.
Inside the Starter Gear cover, there is a gear which has a gearshaft which is held in place by the cover. Really sort of a cheap way to hold the gearshaft in place. If the gear comes out, you can slip it back in.