Are your carbs flooding and all the settings are correct ?

[Mike F]

Hi All
If any of you have trouble with your carbs and can't find anything wrong and all the float heights are correct, check this:

After many months of trying to fix one of our members carbs, I eventually figured it out. They had been having intermittent flooding problems and it wasn't always the same carb that was flooding. All the float height settings were correct and nothing would be found on dismantling.

What I finally discovered was that the tang on the float arm (arrowed in 1st picture) was allowing the needle valve to drop too far and jam (you can actually see the valve in the jammed position above the arrow). This is what caused the carb to flood but the process of removing the carbs always unjammed the valve.

The normal setting can be seen in the 2nd picture.





I hope this is of use to someone out and may prevent a lot of pulling out of hair.

Keep revving.

[GNEPIG]

..i had a problem like this once, the bike would run fine on the center stand no leaks or anything but by the time i would hook the air box back up take the bike off the center stand and push it out of the garage and sit on it it would start leaking... it took two days of cursing and kicking things around and then i noticed the vent hose [from the carb to the air box] was kinked... i shortened the hose a little bit and it never happened again
.
..two days on that learning experiance

[prometheus578]

Mike F... I like those little arrows! And I have encountered the prob that you described.

Gnepig... I've seen that one,too. The nearest that I can figure is... with the vent hose blocked, as the float and fuel rises, the increase in air pressure inside the bowl changes the bouyancy charactoristics of the float(not allowing it to close the needle when it should), or the air pressure in the bowl forces the fuel up through the main jet tube and out the carb.
If anyone knows the correct version of this, please let me know.

[Mike F]

Prometheus578...I used Paintshop Pro to do those arrows.

I wish that I could use the computer to fix the bike sometimes. A bit of Cut 'n' Paste and hey presto - the cleanest, fastest and most reliable xs11 on the planet.

Keep revving