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CB500/550 / Re: Testing carb float levels with water?
« on: May 15, 2018, 05:04:51 PM »May sound a daft question but am just rebuilding my carbs and wondered if i can test the float level using water (off bike of course !!!)
Just hate messing around with petrol all over the place
But maybe water has some different physical property from petrol that means its not feasible
Also does the level need to be about 2mm below the bowl/body joint from memory?
I found that testing with water doesn't work!
I had a fuel drip from the float bowl overflow pipe on my 400/4. It had new float valves but I checked the one that was dripping for dirt and made sure it was seating ok. Still dripping.
I'd read that the brass overflow pipes sometimes crack and cause a leak so I took off the float bowl again and filled it with water. No leaks, so it must be ok, right? Wrong.
When I checked the bowl again with fuel it didn't leak at first, but after a minute or so it started dripping very slowly and the outside surface of the external pipe was wet. It must be finding a way down the side of the pipe between the aluminium bowl and the pipe.
I won't check with water again.