My first yellow GT, rough 147

[dschwandt]

Looks like you need a new front coupler as well while you are at it.

 

[Brad Kamm]

Replaced needle and seat, will remove the float and check to see if that leaks.

 

[Brad Kamm]

So I replaced the float and float pin. Cleaned and flushed everything out and it still pours gas out the overflow. I removed the bowl and turned the gas on, I can easily start and stop gas flow by gently raising the float. All new parts are OEM. The only part I can’t remove is the brass piece that threads in from the bottom. PO stripped the slot and can’t remove it without an easy out, I don’t know the technical term and can’t find a replacement. Could that piece cause it to overflow??

 

[mfrade]

No, it's the float that controls the needle and seat - that opens / closes the gas flow. is the needle rubber tipped or solid metal? Can you see if the seat has any visible damage?

 

[Brad Kamm]

Both are new, needle is rubber tipped. Is it possible that something is preventing float from lifting??

 

[mfrade]

Sure could.. does it move really easy? Also shake it next to your ear, do you hear liquid inside? If you do hear something inside then it has a leak and will need replacing. I've known folks to dry out a leaky float and resolder the joints and leak if you can find it.

 

[Brad Kamm]

It’s new, doesn’t have any liquid inside. Feels like it moves freely, not sure what to check next.

 

[dschwandt]

Adjust the float tab per the manual so it hangs correctly

 

[bmader]

If the previous owner stripped out the slot in the seat there could be a slight burr in the hole. If you take a drill bit just slightly bigger than the hole, and I do mean slightly, and with your finger tips and light pressure twist the drill bit back and forth you should be able to take off the burr cleaning up the seat. Per David, by adjusting the float tab per manual spec's, it will, by design, put more up pressure on the needle to seat correctly in the brass seat.

 

[tkhoffman]

Is the float. Floating? Sounds like the needle valve isn't getting pushed up by the float. Is there any liquid in the float when you shake it?
A stripped Emulsion Tube an easy out will ruin the Jet hole size. That's not you flooding issue

Sorry, I just read that the float is new. With the carburetor held upside down and all the components assembled, the float should test about horizontal. Parallel to the base of the carb.
Boy it sure seems like you have it all covered. You can lift gloat and cut off flow, that's working
Confusing, for sure

 

[Brad Kamm]

How does fuel get to the overflow port?

 

[mgonitzke]

How does fuel get to the overflow port?

By overfilling the float bowl.

 

[mfrade]

Can you show us a picture of the assembled float / needle in the carb but upside down?
You said you can gently raise & lower the float and start/stop the flow of fuel. If that is correct, there is no reason the float shouldn't do that on it's own. A couple pics (different views) showing us the float, with the unit upside down, may give us a answer. And there is no "overflow port".. it's flooding.

 

[dschwandt]

Think about it....
Gravity feed here....
If the needle seat does not seat, the fuel will leak past it and seek it's own level up through the the high speed needle ass'y just as if it were running only it has no where to go but back out through the carb intake until the tank is empty.

 

[gary noblit]

Brad, you already know this carb has been damaged by prior owner ,youdon't know what else he might have done....give in,change carbs.....my opinion

 

[mgonitzke]

And there is no "overflow port".. it's flooding.

There is a bowl vent. I think that is what he is referring to.

 

[Brad Kamm]

There is a bowl vent. I think that is what he is referring to.

That’s what I was referring to , what is the path from bowl to where it drips out. If I could find that damaged part I would buy one. I’ll take some pictures this weekend.

 

[lpalma]

There is no part, it is a machine process on the carb itself. When you take it apart again, you will see a 1/4" hole under the flat area, that is the vent, it goes out under the intake
side of the carb

.

 

[hydroharry]

Brad - I didn't see anyone else mention this so I wondered if you installed the new gasket on the seat screw before you screwed it into the carb.. It's the little round black gasket that comes in the carb kit (stole this pic from Charlie).

 

[Brad Kamm]

The kit I got didn’t have the black gasket, I’ll check the part I took off for the old one.