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Discussion Starter #1
The number 3 carburetor on my 77 CB 750 is leaking fuel out of the overflow tube. I've never messed with the carburetors before, but I'm thinking that it could be a stuck float. Is there any thing else I should look for that could be causing the problem?
 

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I just had the same problem on my CB350 and it turned out to be a leaking float. The only way to tell is to remove it and shake it to see if there is liquid (gasoline) inside. I replaced it. They can be repaired but not easily. When the solder melts, it ALL melts, as I have been told. This might not be good to try with an open flame!!
 

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Discussion Starter #5
I'm not sure what the final cause was, but this is what I did. I adjusted the float hight on all the carbs according to Clymer and still had the problem. I took the bowls off again and notices that the float hight on #3 was not where I had adjust it. I swapped the #3 and #4 needle valves thinking that if the problem is the needle valve then # 4 should leak. I readjusted the hight on #3, thinking maybe it was stuck a little the first time I adjusted the hight. And reassembled every thing again. #4 started leaking, I rapped on the bowl a couple of times with the handle of a screwdriver and it stopped leaking. I'll keep an eye on it. Aren't gremlins fun.
 
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