I have a 2009 carbed LX150 w/just 500 miles that runs ok under load but idles rough. It is emitting black smoke at the moment and I'm assuming it is a rich condition. I ordered a new petcock thinking that there maybe fuel entering the vacuum hose but just realized that this model has no vacuum hose coming from the fuel tank, but a direct feed style petcock that sends fuel to a fuel pump. The EVAP hose has been disconnected from the carb but makes no difference when connected. Any suggestions on how to proceed with cleaning up my situation? Thanks in advance....