Your float, float height, valve, or seat is the issue. I bought floats for a cx500 recently that didn't seat the valve correctly and overflow was a constant issue. Bought another set and things were corrected.
I wouldn't use qtip on the drill but do it manually, polishing float valve seats was also one of the steps in manual I posted!!!Buy new seat/float valves. When cleaning the fuel inlet, I've used brasso on a qtip that was in a drill. Saw that trick on YouTube. Wipe out, then flush with carb cleaner after cleaning so all the brasso is gone.
There could be small hairline cracks in the overflow tubes. I had two of them cracked and repaired them with solder. Take the bowl off, fill it with liquid, plug the top of the tube, connect a tube to the bottom connection and blow into the tube. if you see bubble, that is your problem.My carbs are leaking out the over flows. All new parts inside.
Took them off twice now.. please advise..
VB 42 A carbs..
Mine had hairline cracks parallel to the tube. I wonder if water got in them and they froze? Easy fix with solder. I used low melting point solder and a grill lighter for the heat source to solder it.Wacky, what causes the overflow tubes to crack? I've been fortunate enough to never see that in my carb work so far, but now I know to keep an eye out and keep my soldering iron handy...