Ever since I finished my bike I was amazed at how much power it had, I never took it to full throttle because it would probably break something. Now, the amount of power it has is ridiculously low. It very slowly accelerates to 10-15mph with the throttle wide open, and makes a strange boggy sound when I go full throttle. Before this problem, I could just slightly twist the throttle to achieve this speed. Fuel also comes out of the air intake, I can see the back of my bike is wet after rides. No oil is leaking, however. I installed a new carburetor, and the engine showed no changes in performance. I installed a new spark plug, and again it behaves exactly the same. I observed that before I had this issue, the gases coming out of the exhaust had more of a "punch", like little explosions even when idling. Now they are very weak. I flushed the exhaust with gasoline to clean out as much sludge as I could, but there is no improvement in performance. I remember leaving the petcock open a few times for a number of days and when I got back there was oil dripping out. I would start the bike and it would smoke but then get better and return to normal. My fuel is 32:1 and is relatively fresh. Anyone have any ideas on what is causing this?