Question about carburetor drain and overflow - Honda Rebel Forum
 
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post #1 of 4 Old 08-20-2019, 02:48 PM Thread Starter
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Question about carburetor drain and overflow

I have gas leaking from the drain hose (bottom of the carb) when the bike is off. I have cleaned the carb, and replaced the float and float valve. I'm thinking the issue is the valve seat. I will be polishing that next.


I am not clear on the carb overflow mechanism. It appears to me that the carb is filling up and overflowing through the brass tube in the carb bowl, then draining out the bottom hose. However, most of the information I can find on this forum is telling me that in an overflow situation, fuel will leak from from the upper hose (I have seen it referred to as both the overflow tube and vent tube). I am reading that the bottom hose is for draining only. If that is the case, what is the brass tube inside the float bowl? Where will fuel leak from in an overflow situation? Can someone help me understand this?


Thanks
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post #2 of 4 Old 08-20-2019, 03:18 PM
 
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you are correct the brass tube inside bowl is the overflow tube origin..
But the overflow hose that connects to bottom of bowl is also connected to upper vent tube via T fitting..

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post #3 of 4 Old 08-20-2019, 03:46 PM Thread Starter
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Thanks SoakedKarma. You are correct, the two are connected by a T fitting when assembled. However I have it dissembled and am using separate hoses for my diagnostics. All of the leaking gas is coming from the lower tube.
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post #4 of 4 Old 08-20-2019, 04:28 PM
 
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Q-tip with a little rubbing compound to polish seat.. cut one end off and chuck in drill makes quick work of job..

warming/bending plastic tab has been used to adjust Non-adjustable float in a pinch..

96 VS800 Intruder (sold 2018 ), 87 CMX250C Rebel,
79 CB400 Hawk (sold 93), 75 CB350 (sold 83), 71 CB350 (stolen 74)
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