Obieport ! Do You Copy ?
Obie-one-kenobi!
How ya doin? Can you read the Hitachi No. on the top of the carbs? It should be HMB46W -*4 or *5 with * = F or R for front or rear carb. These should be excellent carbs. (The early carbs on the 73 240 had -1 and -2 versions which had problems.)
The excess fuel thing is due to one of two things:
either your carb fuel bowl inlet needle valves are sticking open, or the floats are badly adjusted. Did you find the little round window on the side of each carb. Best observed with a flashlight and small mirror. Needles sticking open could be due to crusty fuel (sitting up for two years). Maybe the mech didn't change the needles?? Or crud from the lines is causing them to hang up. Before you start stripping off the carbs to tear down, it would be a good idea to change your fuel filter. Cut it open and check for fouling. If bad, then tank flush may be recommended. Also, were the fuel supply lines hook onto the carbs, I believe there is a banjo fitting relatively easily removed with a fine screen which could be checked (I'll check that out when I get home). I'm a big believer in Marvel Mystery oil. Very good at disolving gas deposits and unsticking sticky carb parts (also hydraulic lifters when added to engine oil). Try chemical warfare before resorting to serious wrenching! If you do get to point of pulling carbs, let me know and I'll get you detailed info on setting floats - although the proof of pudding is in the level in the window.
or you've got excess fuel pressure which is forcing the needle valve open. Check that your fuel supply and return flex lines are not reversed, both at the tank and at the engine bay. (Note the cap with orifice on the return end of the engine fuel rail.) This could cause both pumps to pump into the fuel rail and could well overpressure the needles. Should be only about 3-5 psi. Beware FI fuel pumps. These look the same but pump way too much fuel for n/a carbs.
Good luck!
I'm pullin for ya!
-Al