Every service manual misses SOMEthing. Here are two things not in the Kymco documents.
1). To change the air filter cover, it says to remove 6 screws. True, but that still leaves a metal strut/bracket in front holding the cover in place. I undid the bolt holding the bracket to the frame, leaving the bracket attached to the cover. Somewhat hard to get back in place (you need to get the bracket back behind some other metal tabs near it), but at least it will come off.
2). In order to change the spark plug, the instruction says "remove frame cover". Even after you figure out that it is the black plastic vertical piece behind your calves, you will not see a single screw to undo. Fear not, first just lift up the rubber floor mat (it snaps in place)
and you will see two inviting-looking screws. After you undo them, it still won't come out. Open the seat and you will see a VERY large screw holding the back of the frame cover on. Take this off, and the only thing holding it in place now is friction on the snaps.
Please add and modify this thread as you find out new "gotchas".