450 carb issue... Bogging & fuel venting out vent tube

[Dave_A]

On my 450, I have started to notice a carb problem...

The bike will start to bog & simultaniously dump fuel out the vent tube of one carb (not both) - dumps as in a steady flow. Adding choke corrects this, but that's nbviously not the solution...

Any ideas?

[SqDancerLynn1]

If it is dumping fuel out of the vent The carbs are flooding Check the float valve in the carb

[KEITH KRAUSE]

The tube you describe is the overflow tube under the carb. As SqDancer said, check your float needle valve. It's a valve that the tab on the floats pushes against. You may have some dirt or rust particles interfering with its ability to seat. It could also develop a small burr on its side and it's hanging up. It may also simply be worn and needs replacing.
If you have a short screwdriver you can remove just the carb bowl and service it.

[robinjo]

I would take them off and give them a good cleaning, especially the float needle area and check the float level.

[nabrams]

When I had that problem it was a leaking float. Take it off and make sure there's no liquid sloshing around in there.

[Dave_A]

Float needle seat was loose (on 80-82 450s, they SCREW into place, instead of press-in like the bigger GSes & 83+ 450s)...

FIXED.