So I been having issues keeping my bike started after I did a carb clean. It usually dies out as soon as I give it throttle. I cleaned the pilots again and same thing. I was getting into a let's try anything mode so I covered the end of the top vent hose on the carb and tried starting to see what happens. Well, it runs and it will stay running after I rev it. Runs normal. I leave it uncovered and it dies out. Any reason why this would happen???