Fuel running out of the front of my carb

[Guest]

I have fuel running out of the front of #2 carb, out of the hole / orifice opposite the pilot air jet. It's the one that nobody removes when soaking a carb. What could cause that? I can't find it called out anywhere on mikuni diagrams. There's an orifice there though. Stuck float?

[chef1366]

Check your petcock vacuum line for gas.

[BassCliff]

Hi,

Here's some information I've collected...

Overflowing Carbs


Thank you for your indulgence,

BassCliff

[86turbodsl]

Ok, I took a spare carb body I had laying around, and put a little bit of carb cleaner down the hole that's peeing gas, and it came out in the main jet/emulsion tube cavity. So maybe a stuck float is letting fuel rise up the main well and pee out the hole?

Cliff, I checked out your link. Still thinking about it.

[bwringer]

If your bike is peeing gas while running, what I've seen several times is that gunk from the insides of a corroded old petcock gets down into the carbs and props open the float valves.

An intact petcock has a very efficient fuel filter built in, so gunk from the tank usually doesn't get to the carbs; however any bits of corrosion from inside the petcock have a direct shot to the carbs. This usually happens when someone moves the petcock handle after it's been undisturbed for years.

[86turbodsl]

This bike has never run. It's fresh off a carb rebuild. I have 7 inlet valves, and it was a bit of mis/match since none were labeled. I used the 4 best looking ones. I think I'll pull the carb today and replace the inlet valve.

[86turbodsl]

It's confirmed. My float valves are leaking. I have been in leaky carb hell all afternoon. I have the carbs setup on the bench, level both planes, and have been replacing float needles one by one. I still have two leaky carbs. Nothing seems to work.

How important is the fluid level checking as on cliff's howto? I set the floats as on the howto, but I had to bend all the tabs to do it. I've never had to bend tabs that much before either. But I did all the carbs the same, and the other two aren't leaking.

Any ideas?

[BassCliff]

Hi,

Float levels are important. They cut off the fuel supply when the bowls are full. That way the carbs don't overflow. Too low of a fuel level and the cylinder can run lean.

Sometimes the float valves (needles and/or seats) can be worn just enough that they will leak but not enough for you to see it with the naked eye. Or it could be that the parts in aftermarket "carb kits" are inferior and not to spec. Replacement with genuine Suzuki OEM parts is recommended. See: Overflowing Carbs


Thank you for your indulgence,

BassCliff