GS450 carb woes

[Guest]

so this is a new issue, even for me. I purchased a set of used carbs online, rebuilt completely with OEM gaskets and o-rings, stuck em on the bike and ran AWESOME!

Tuesday night, bike ran perfect. Wed morning i get a phone call from my girlfriend saying that the bike is leaking. Wonderful.

So i went down and looked, the bike is literally, pouring, fuel out of the number 2 carb vent, and struggling to fire. Where do i even start?

[Dave8338]

so this is a new issue, even for me. I purchased a set of used carbs online, rebuilt completely with OEM gaskets and o-rings, stuck em on the bike and ran AWESOME!

Tuesday night, bike ran perfect. Wed morning i get a phone call from my girlfriend saying that the bike is leaking. Wonderful.

So i went down and looked, the bike is literally, pouring, fuel out of the number 2 carb vent, and struggling to fire. Where do i even start?

Replace your petcock, with a new one. That or try to tap the side of the float bowl for #2 and see if it is just a float hanging up.

My money would be on the petcock...

[pete]

Could be the float valve too.

Number 2 on a 450 doesn't have the vacuum port, so not sure if that rules the fuel tap out or not...

[koolaid_kid]

What was the petcock set to, PRI, RES or ON?
If it was set to either ON or RES the petcock is faulty. By design it should not flow any fuel unless there is vacuum on the vacuum line, which only occurs when the engine is running.
If it was set to PRI there may not be anything wrong at all.

[rangerdanger]

petcock was set to ON. bike does not flow fuel with the engine not running.

Im just at a loss because this is like..50 miles after a COMPLETE overhaul. clean everything, weird.

[tom203]

petcock was set to ON. bike does not flow fuel with the engine not running.

Im just at a loss because this is like..50 miles after a COMPLETE overhaul. clean everything, weird.

There's only one place for the fuel to keep flowing from...... that's right ,the petcock! Not convinced, disconnect both lines from tank, add some gas ,and be patient.

[koolaid_kid]

I agree with Tom. You only have a sample size of 1, which is not enough to state that the petcock does not flow. You have a sample size of 1 which showed it will flow with the engine off. That should be enough to realize that it are bustificated. Get a new OEM unit and wait another 30 years for it to start leaking again. Also, take a whiff of your oil. It is entirely likely that it smells like gas. If so, time for an oil and filter change.

[Nessism]

Rust in the gas tank fouling the #2 float needle?

[Dave8338]

Rust in the gas tank fouling the #2 float needle?

Was my mention for the "rap on it and see" comment.

Still...if the petcock is working correctly and is set to ON or RES, there will be no fuel to leak past the seat, other than what is in the line and I doubt that would happen to the extend that he explains.

Never know...

[rangerdanger]

Figured it out.

[koolaid_kid]

Oops. Is is fixable?

[rangerdanger]

Hard to tell. I could attempt at soldering the seals. May be more reliable to just buy a new float.

[koolaid_kid]

You could try the parts wanted section here. There are lots of carb guys here, perhaps someone can help you out with a gently used float.

[Nessism]

I'd solder it. Get some plumbing solder. Not the stuff for electrical bits. And test for leaks afterwards.