new member with trouble

[chaco]

So my names Keith I'm from Aberdeen Maryland. I have a 2012 taotao 49-50cc scooter. I have put numerous parts into the scooter. When I bought it I had no idea that there is that much too them. I had bought it with the intention that it need a new belt cause a friend couldn't get it on. Needless to say it needed more he sold the cdi box. So I bought everything and some because it would not start. Well now it starts some times but Boggs out. Without the belt it runs fine revs up and everything. Why is it doing this please help. And when it does start with the belt on it dies down and the back wheel doesn't got as fast as it should. Thank you for your time.