The oil tank you have is off a later model but look similar.
Oh, the ignition switch. Do you have one?
It would mount under the tank on the left.
Yes that's where it is now. Guy told me that it was replaced but it has what looks like an OEM Honda key. Not sure on that one.
Just went out and hooked up the starter cable to that solenoid and then sprayed a little brake cleaner into the carbs to prime them and hooked up the battery and tried to start her. Found out that the off/run switch doesn't work it's always on. The starter wouldn't shut off unless I turned off the ignition. It turned over then made a bad noise like the bendix in the starter was bad. turn, turn, turn, wingggggg! Then if I wait and try again it cranks then winggggg!
Finally after a few more sprays and cranking she roared to life and scared the piss out of me since it has no pipes on it.... then it died because I have no fuel tank hooked up.
I really don't know why I punish myself with these type of projects....
Like I don't get enough of this crap at my job working on Honda cars.