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  #11  
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Quote:
Originally Posted by JSH View Post
Help?
I pulled the carb again and checked float needle and seat. It was in correct adjustment and sealed easily when the float was gently lifted. I checked for a leak in the bowl overflow tube - perfect seal, even under air pressure.
How did you check for a leak in overflow tube... what procedure?
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  #12  
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Quick answer would be to take the float bowl off of the carb and fill it with water, if water starts coming out of the overflow before the water level reaches the opening in the top of the tube, there is a crack in it. Heck, IIRC the opening in the top of the tube should actually be higher than the top of the float bowl so it shouldn't flow out at all with this method.

What I do (not that anyone asked) with needle seats is to cut a cotton swab in half, stick the cut end in the collet of my dremel, put some metal polish on the cotton end and polish the brass seat with it. You will need to shoot some cleaner through the aperture to get any polish out of it but it leaves the brass super clean and shiney.
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I suspected the overflow tube leaking, so tested it under pressure. It held fine. The tube is not cracked or corroded.
The accelerator pump is correctly installed.
Mike's idea about the fuel leaking around the float needle insert is interesting, and I'll check it. It's not leaking a little though, but a lot - just as if the float is hung up, but it's not.
I looked around for a new stock carb, bowl or float with no success. Anyone know of these for sale anywhere?
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The needle seat is plastic or bakelite, not brass like the old ones. I cleaned and honed it gently. The procedure for testing the float bowl was, as you said, filling it with water. It did not leak. Yes, the tube extends above the bowl top, so that is not an issue. I even put compressed air to both ends of the overflow circuit while the water was still in the bowl, while it was gently chucked in a vise and level. If there was a leak anywhere, it should have bubbled with the air pressure. I tried two different needles, both clean and apparently free of defect.
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Is it possible the float just isn't...floating?

Mine looks like some sort of closed cell foam. If the foam degraded and absorbed some fuel, or some of the goo you cleaned out of the carb, maybe it's too heavy?

Maybe someone can weigh a good one, or measure how high it floats above the fuel.

Can you get a replacement float?
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I tested the float for buoyancy for about 15 minutes. It's made of hard hollow plastic. I mmersed it in a cup of water repeatedly, and it floated very high without ever becoming saturated at all. I did wonder if a water test is truly effective, as gas is thinner than water and can get into places water cannot. But, upon removal from the carb there is no gas inside it, and I can see no apparent holes.
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Sounds like you’ve ruled out the float itself. Install float and leave bowl off. Close it by hand and see if any fuel is passing through somewhere.
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I like Mike's idea.

Just to rule it out:

How, exactly, did you set the float level? What technique and measurement?
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It might be helpful for you to post some pictures of THIS float bowl & also several from different angles of the float mounted on the carb, the float valve needle & the valve seat...

Nice clear pics...


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