Topic: carb overflows

[neilc]

Started the bike today after about 2months now overflows leak gas on #3&4 until I rev the motor after she runs for while all is good I hope once the bike goes on the road and I put some miles on it it settles down until then like usually pet stays off w hen not in use,also the previous owner put a high performance cam in it,wish he didn't

[Stev-o]

Drop your bowls and make sure the floats aren't stuck

[StudioRat]

what bike?

[flybox1]

While you are turning on your pc, tap your bank of carbs with a rubber mallet.  It will free them up, but yes, floats are probably sticking....

[lucky]

Float bowls can over flow for several reasons.

1. The float level is not set properly. (By the book)

2. The overflow tube in the float bowl can have a hairline crack in it
allowing gas into the overflow hose. (need a magnifying glass to see it)

3.The float can be stuck because the gas in the float needle and seat
 area dried up into a sticky goo and the float needle is stuck open.

(Tap on the float bowl with a plastic screwdriver handle gently)

[kck3]

4. Float itself could have a hole or crack and filling full of gas.

[Deltarider]

4. Float itself could have a hole or crack and filling full of gas.

Not ours.

[flybox1]

floats can also stick because tank debris blocks the float valve from closing properly.

the original post mentions that during operation, there is no leaking, which leads me to believe the float corrects itself and shuts off gas, either by working any debris past the float valve, or releasing the float from anything it might be hanging up on. if there were a hairline crack in the stand pipe, the leaking would not stop until the bowl was nearly drained.
id pull the bowl and dump gas into a clear glass to glance for debris in the bottom, then pull the float pin and give it a quick polish, and run a pipe cleaner soaked in carb cleaner through the float pin hole.
Verify float height is set properly, that it doesnt hang up, and the valve closes and shuts fuel flow.  if these are sorted, its most likely tank debris....

[neilc]

okay ,hate to pull carbs again to check height again,think ill pull bowl,have to fix overflow screw anyway

[flybox1]

before you do, place a clear jar below your overflow tubes, open your drain screws on 3 & 4, turn on your fuel, and let 3& 4 drain for a bit into the jar.  1-2 cups.  really let it flow.
shut everything off and check for debris in the bottom of the jar.
if there is, some attention to the inside of your tank is needed, or a good (gasp!) inline filter (bandaid) 

oh crap...did i just say that!   
this might be the reason 3-4 leak, if you are certain your floats are set/working properly.

[neilc]

If it happens again on 3 I will swap floats 3&4 with each other