Just got the bike and one of the carbs tends to leak. It happens anywhere between 5 minutes and several hours after I turn off the bike (with petcocks off). Shaking the bike a little bit tends to trigger it.
I know there has been several posts on leaking bing carbs (I've read them all) and I've gone through snowbums writeup on the bing CV dance.
https://bmwmotorcycletech.info/Carburetors-that-piss.htm
The carbs were rebuilt 3 years ago with new floats and needles but the bike has been sitting for a long time so I figured it was probably just dirt in the needle seat. However, flushing it didn't solve the issue. With petcocks open I can easily completely stop the fuel flow by lifting the float with my finger. The floats also seem to be adjusted correctly with the top of the float aligning with the carburetor body at the moment fuel starts flowing (I've attached two pics, one where fuel flows and one where it doesn't).
Measuring the fuel in the bowl after letting it sit for a little while with open petcock I measure around 16mm which seems to be a bit low. I don't see how low fuel could cause a leak though.
I've also tried placing the full bowl on a paper towel for a while to make sure there's no leak from the overflow pipe and there isn't.
I'm out of ideas. I guess the float might get stuck somehow but I don't see how that could start leaking hours after I turn off the bike.
Any thoughts would be appreciated.
I know there has been several posts on leaking bing carbs (I've read them all) and I've gone through snowbums writeup on the bing CV dance.
https://bmwmotorcycletech.info/Carburetors-that-piss.htm
The carbs were rebuilt 3 years ago with new floats and needles but the bike has been sitting for a long time so I figured it was probably just dirt in the needle seat. However, flushing it didn't solve the issue. With petcocks open I can easily completely stop the fuel flow by lifting the float with my finger. The floats also seem to be adjusted correctly with the top of the float aligning with the carburetor body at the moment fuel starts flowing (I've attached two pics, one where fuel flows and one where it doesn't).
Measuring the fuel in the bowl after letting it sit for a little while with open petcock I measure around 16mm which seems to be a bit low. I don't see how low fuel could cause a leak though.
I've also tried placing the full bowl on a paper towel for a while to make sure there's no leak from the overflow pipe and there isn't.
I'm out of ideas. I guess the float might get stuck somehow but I don't see how that could start leaking hours after I turn off the bike.
Any thoughts would be appreciated.