The side covers and center covers fit together with tabs and
slots, you have to undo them and redo them in the right order
and the right way to ensure that you don't break any
of the tabs or slots. The method is detailed in the owner's
manual.
I jumped on a desmog right when I got my bike. Later, I
helped Stanley Steamer replace his vacuum lines... I don't
think I'd desmog again unless I thought there was something
wrong with the little valve cluster that all the hoses go to...
My strategy is to ride the bike often enough to keep it from
gumming up. I've never touched my carburetors.

-Mike