bike carburetor help, anyone?

starving for fuel. your mechanics are missing something. I would focus on the float and it's chamber. obviously can't be a blocked passage or jet as surely the multitude of mechanics attempting to fix it blew them all out with compressed air. right?

 

how about you replace it?

 

I have an SZ and for sure you have too FEW miles on it (I'm at 70k). These bikes really seem dependable for the most part.

That carb can be a monster, but there are ways to try.
1. I think your float level is off
2. Like someone said, on these motorcycles, the choke cable can rust, freeze and cause many problems (but not your current problem.
3. I had a problem and tore that carb down maybe 6 times...finally fixed it:
a. choke cable issue AND LATER spark plug gap (my feeler blades were stuck together, so too wide)
b. that overflow tube leaking is a known problem. Can fix with epoxy or as you did.
c. Why don't you search for a 2nd hand carb and just swap out?
4. If you really want to find the problem, then it's cool...and fun.

NOW I have a CLEAN WORKING CARB!!!

 

I had a problem with the carburetor on my SZ and years ago last time I play with stuff like that. I went to Yamaha Perdices St., in Dumaguete where I bought the bike, get the carburetor fixed', guess the young man was 16-18 years old but for sure he knows what he was doing, parted the carburetor and reassembled it, I don't remember what I paid just it was very little, of course, I gave him a tip and when all are happy you can't ask for more