From the float needle valve back to the tank, it sounds like the needle valve is stuck or not enough fuel in the tank.
Al.
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Fuel Mystery: My Carburetor Is Defying Gravity - SOLVED!
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Muddy
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That sounds like a good suggestion. With the bowl off, fuel should run into the catch tray and the flow should stop if the bowl is raised.AlanW wrote:Try unclipping the bowl, let the float hang down, put a small tray under the carb and turn the fuel on. It should flow and if it does then lift the float to make sure it cuts the fuel off. If no fuel comes out work back from there.
I hope this helps, Al.
With the bowl off, if there is no fuel coming out of the carb, remove the fuel hose. If there is fuel at the fuel hose outlet, the issue would appear to be the barbed fitting on the carb or the needle valve. Needle valves (especially the wrong ones) are know to stick. You didn't happen to put a Keyster kit in the carb did you?
Thanks.
Regards
Muddy
'64 C72
'63 C72
Regards
Muddy
'64 C72
'63 C72
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Dr. Frankenstein
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- Location: Charlottesville, VA
I got it figured out. I opened up the carb again and noticed that when I was putting the bowl back on, it was bottoming out and raising the floats, effectively shutting off the fuel flow.
I took the carbs out and noticed that somebody in the past had actually tilted the floats/float arm arm Down, making the floats go deeper than they should - I have no idea why. I had originally measured 26.5 mm from THAT float height, so of course it would shut it off as the bowl went on...I'd like to know the story behind That...
So to make a long carb adjustment story short, I straightened them out, remeasured and adjusted the float height - although it seems happiest at 25mm - and finally got a good positive fuel flow.
At 26.5mm, it was allowing Some fuel to get through, but it was just a bare trickle; I don't think that other 1.5mm is going to make a big difference anyway, and I can always adjust it with the air/fuel mixture knob.
And around 1:15 pm this afternoon she fired right up, for probably the first time in 30/40 years! It ran great, too, I just had to adjust the mix a bit.
I'm always surprised at how loud these little 305's are though, especially in a garage...now I just have to tweak it and make sure everything is doing what it should do, put the tank back on and make sure that's okay, and then ride it a bit to wake her up some more. I'll post some before and after pics when I get the chance; she's come quite a long way.
I took the carbs out and noticed that somebody in the past had actually tilted the floats/float arm arm Down, making the floats go deeper than they should - I have no idea why. I had originally measured 26.5 mm from THAT float height, so of course it would shut it off as the bowl went on...I'd like to know the story behind That...
So to make a long carb adjustment story short, I straightened them out, remeasured and adjusted the float height - although it seems happiest at 25mm - and finally got a good positive fuel flow.
At 26.5mm, it was allowing Some fuel to get through, but it was just a bare trickle; I don't think that other 1.5mm is going to make a big difference anyway, and I can always adjust it with the air/fuel mixture knob.
And around 1:15 pm this afternoon she fired right up, for probably the first time in 30/40 years! It ran great, too, I just had to adjust the mix a bit.
I'm always surprised at how loud these little 305's are though, especially in a garage...now I just have to tweak it and make sure everything is doing what it should do, put the tank back on and make sure that's okay, and then ride it a bit to wake her up some more. I'll post some before and after pics when I get the chance; she's come quite a long way.