My 66cc engine seems like it's not getting enough fuel in the engine. I start it up and I can ride it and it goes 100% then it kinda starts bogging down. I unplug the fuel line and pour a bit of gas out and it comes out in little drops then flows out normally 2 seconds later. Then the bike rides perfectly again. The same thing 2 minutes later. Is this something to do with not getting enough air in the tank that it slows the gas flow?