MOPED ARMY

I was starting to take of my carburator and I noticed something funny about my fuel line. I can see air in it. About half of the visible tube is filled with air. I would think that since the gas tank is about half full, the whole thing should be filled with gas. There is even a little bit of air in the tube past the little cone looking fuel filter thing. Is this the cause of my losing power? Is the fuel line from the gas tank somehow clogged, or is this a normal sight.

I took off the gas tank and cleaned out the little cone shaped gas filter in the gas line leading from the tank. A fair amount of sediment came out. I also experimented with the stopcock while the tank was off. I found that the open position would not let very much gas through compared with the reserve setting. I put the tank back on and tried to get most of the air out of the recently emptied gas line. I also replaced the old oil with brand new stuff. This time I put the switch to reserve. None of this seemed to do any good. The moped still loses power between 15 and 20 mph, even lower going up hills. And you have to keep it at these speeds with occasional revving to prevent it from dying. Until about a week ago it would go 25-27 mph on flat ground with no problems of losing power/dying. Do i need to proceed to cleaning the carburator?

Hey guys!

I cleaned the carb with some cleaner and now it works great! Back to her old self again. I just have some questions about the screws. I set both of them back to their original positions even though they were different then your suggested placements Jax. If I'm setting them, what should I be listening for, or feeling for when I'm riding it, so I can get the correct setting? Thanks so much guys! Man scooters are so much fun. I love my little Express.