non-vacuum petcock overflowing

[Netz]

I´m using a non-vacuum petcock on my 650 chopper. When I mounted the petcock and filled up gas the carbs will start overflowing fuel from both side out the drain. Any suggestions what to do?

 

[jayel]

your needle valve/seats aren't sealing or your floats are sunk or badly out of adjustment, carbs off, clean the needle seats with a little steel wool (just shiny them up) shake the floats while they are off check for proper height