Sorry for this post everyone. I looked at the archive on carb problems but could not find my problem. My 78' GS-750 is a complete rebuild. I took apart the carbs and cleaned the base units with a sonic cleaner. Installed new o-rings and blew out everything. When I place the fuel to on #1 carb leaks out of the hole in the side where the fuel rail is on the other side of the carb. I tapped the bowl with a rubber mallet and it still leaks. Any ideas. Second problem the bike will not start at all. If I spray fuel into the intakes the bike fires up. To me it sounds like the idle circuit is the culprit. The pilot jet is clean along with all other jets. Even if I spray fuel into the intakes and rev the bike to 1/3 throttle the needle valve should take over and run, maybe rough but run. Air screw out 1 3/4 Fuel screw out 2.0. Any ideas i am pulling out the rest of my bald hair LOL!