Hey, I did the rebuild job and it is a good thing I did. I learned something.
First my valve was leaking, the reason for the rebuild. Then the other night on the way home the bike started to sputter and then died. I had almost a full tank of gas I could not figure why it would stop so sudden. I hauled the bike home and let it set over night. While I was laying in bed I remembered the vacuum valve in the petcock assembly. Sure enough the vacuum hose came loose and shut the flow of gas off. If I hadn't known about the valve I could have paid someone $80 to say ha, ha dummy. Some times we can step in it and still come out smelling like a rose.