82 CB750C CARB LEAKING

[N1YDP]

#1 carb will leak out of the overflow for a second then stop for a second.took carb apart and cleaned the jets and needle and seat.but still does it.

[N1YDP]

it only does it when running

[cdaiscool]

What's the needles look like? Floats? Are they moving together nicely?

[seestheday]

Do you still have the SOS on your carbs?  If your fuel line runs straight into your carbs then it's been removed.  If your fuel line runs into a mess of tubes then that mess of tubes is the SOS.

If you still have it then fuel won't reach your carbs when the bike is off, so that is why the issue doesn't happen when the bike isn't running.

You likely have a stuck float valve.  Did you polish the float seat until it was shiny?  Verify that it was shutting off well?

A cracked overflow tube, or broken float (that fuel has leaked into) would cause the same issue.

[cdaiscool]

Best way to check for a cracked tube is to fill the bowl with water and see if anything comes out from it.

Clean the float seats with brasso and a Q-tip. Works amazingly well, it's a wonder how much crap comes off it.