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Carb Leak, Simple Fix, but Long Time Finding Fault!!!

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rbt1548:

--- Quote from: LetsRide on October 20, 2022, 12:16:51 PM ---I am in the process of re-assembling my CB00/4 carbs and the float  bowls were going to be fitted today. I came on to the forum to see if I could establish (beyond doubt) which way the main jets go in and saw this article. Timing could be good for me as three of the four carbs were leaking fuel out of the over flow pipes when I started this project. Assumption was that the floats were stuck in the gloop at the bottom of the float bowl (and there were signs on the floats this could be the case). I will now do a quick check around the overflow pipe/bowl joint.

--- End quote ---

The way I did it , and I'm sure there are other ways, but it seemed easiest for me, was, took the float bowls off and connected the flexible overflow pipe to the petrol tap outlet, I then turned the float upside down so petrol would flow out of the brass overflow pipe, then put my thumb over the hole in the brass pipe and then turned it correct way up, held it for a minute or two to ensure the tube or joint stayed dry. If you put your thumb over the pipe before turning fuel on the fuel won't flow up to the brass tube as you will have created an air pocket and with the float turned upside down initially the petrol will run out the pipe without getting the pipe or joint wet making it easier to see if there is a leak, it was more of a seep on mine but enough to cause an overflow over time.
I may have made it sound more complicated than it is but it is very, very easy to check.

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