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I've done a rebuild a few week ago. Now I have a few issues to fix. One if them is the following.
The engine wasn't running nice at all. Remove the carb bowl and clean up the Jets. That's it!
After putting everything back together, the carb are pissing from the overflow. Remove everything twice to readjust the stop plate! Still doing the same thing. After checking out, the needle does seals well when I close them manualy no fuel is coming out.
Did you set the float height? Float height is 24mm I believe but you better verify that. Also check the overflow tubes inside the float bowl, sometime they develop cracks that allow gas to leak out. Do you have a float bowl gasket on the carbs? If so, depending on the type they could be interfering with the float preventing it from moving up.
Yes, carb upside down and you measure distance from bottom of float (top since carb is upside down) to the lip of the float bowl. You can get manual for the VM series here: http://www.mikuni.com/pdf/vmmanual.pdf
Usually you don't want to do it with the carb upside down completely you want to go at the angle where the float just rests on the plunger without actually depressing it.
I've seen it happen after a rebuild - if you're sure the floats are set right then the needles and seats are most likely stuck open. Sometimes, especially with ethanol gas, it can happen. Tap each float bowl lightly with a small hammer and see if they stop pissing gas.
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