Re: Cleaning a carb with an overdose of carb/fuel system cleaner???
I did my Honda 8HP carb myself, and it was not that hard - and yes, it worked when I was done. I would recommend buying a proper factory service manual - for Honda, it was maybe $30 or so. I am not a mechanic, but am "OK" with mechanical stuff. That manual is not that great where it describes the carb, but is better than nothing; maybe Tohatsu's are better.
You should be able to see if it will be easy to remove the throttle and choke linkages and fuel lines and then the carb itself just by examining the outside. On mine, there's not that much to remove - the bowl comes off the bottom, there's a float and needle valve inside (watch that you don't let it fall out and lose tiny parts), a nozzle that comes out, remove the drain screw from the bowl, the idle (or pilot, whatever it is called) jet unscrews from the outside, the adjustment screw likewise, then there's the choke plate and throttle in the carb body itself. Now, the aluminum carb body is full of all kinds of holes and tiny passages that snake around the inside (invisibly), I just sprayed and air jetted them as much as I could, and I did not need to do the carb dip routine. There are a few gaskets (one for the bowl and one for the carb to block), just be careful removing them or better yet buy new ones.
I'd try that before buying a new carb - worst case, you kill the old carb and have to buy a new one anyway.