Carbs blowing gas out of #3 and #4 carb

When I leave the fuel in the ON position I don't have any problems with gas leaking, but as so as I fire it up it starts to blow a little bit of gas out of the #3 and #4 carb. As soon as I turn it off it likes to drain out of the #3 carb but not the #4 as much. Any Ideas??

Also can someone provide me with some insight on how to tune my carbs?? I've completely rebuilt them already, but I have no idea how to tune them.

Anyone??

What bike are you working on, what carbs are you working on and where on the carbs is gas leaking from. You didn't give anone here much info to come up with an informed solution.

It's a 2001 KZ1000P with stock carbs (I don't know what they are) and it's blowing into where the air box is supposed to be. When it idles it blows fuel mist and once I give it some gas it'll drip and once its turned off it drains out of the carb where it connects to the airbox.

Bump Bump

BRABBIT04161991 wrote: It's a 2001 KZ1000P with stock carbs (I don't know what they are) and it's blowing into where the air box is supposed to be. When it idles it blows fuel mist and once I give it some gas it'll drip and once its turned off it drains out of the carb where it connects to the airbox.

Well where is the the airbox?

In a pile of other stuff I'm going to get rid of

No offense intended, but if it was my bike I would put the airbox back on, get the bike running properly, and use that as the baseline from which to judge the effects of mods. Then if for whatever reason I wanted to ditch the airbox I would pull it, install whatever air filtration I wanted to keep, and rejet the carbs to try to match the performance of the bike as it was with the airbox on. Was the bike running well before you removed the airbox; what did you replace it with? What other mods have you made? These engines are pretty finicky about changes to the air filtration and exhaust. Does your bike have CV carbs? If so, tuning for no airbox may be more challenging. Ed

The only thing I'm trying to accomplish right now is why the carbs are leaking. It has no affect with the airbox on or off. The bike runs and when I got this it was chopped to hell. So after putting it all back together I finally got it running. Once I stop the leak, I'll take the bike to one of my mechanics and have it tuned to perfection with pod filters. But I'd rather fix the leak myself instead of having him do it. The only thing I've changed on this bike that could possibly make a difference would be removing the emissions crap. but that's it!!

So again I have the #3 and #4 carb leaking gas into where the airbox should be. Any Ideas?

Some of the possible causes could be:
leaking float valve;
cracked overflow tube (on carb equipped with an overflow circuit);
float issue;
float function issue;
assembly error;
obstructed overflow circuit.

Often a leaking float valve accompanied by an obstructed overflow circuit (on carb equipped with an overflow circuit).

Would sniff-test oil in crankcase and examine it to determine whether gasoline has entered the crankcase and diluted the oil.

If fuel contamination in crankcase, take whatever measures are necessary to stop any further gasoline from entering the carbs; change the oil, change the filter; and correct the problem before allowing any gasoline into the carbs.

Assure that a good aftermarket in-line fuel filter is installed. Dual fuel lines require a separate filter in each line.

Good Fortune!

Ok so no gas in the oil and I don't have any overflow tubes hooked up. So now from what I've been researching from other sites is that the float is either sticking or has a crack in it which is making it sink. Thanks for your help Patton I'll keep you posted. I should be able to get it completely done here in the next hour or 2.

If it is leaking out of the airbox side of the carbs (through the carb throats) I assume your carbs have no overflow tubes (otherwise that's where the fuel would leak from). So if that's the case either the float valves are sticking or the fuel level is set too high. I would clean (or if damaged replace) the float valves and if that doesn't stop the leak I would try the clear tube test to see where the fuel level is set. And for sure check the oil as Patton suggests because it may be leaking through the engine side of the carbs too and seeping into the crankcase. Ed