Yamaha Ybr 125

Hello, I am new in this and I do not find much, if someone could help me I have problems with my Yamaha Ybr 125, it seems that it is the subject of the float or alternator I do not know, since I bought it I have problems with the start it went from bad to worse it seems that I improve when I change the battery, but in the weeke float, it is heard weird and does not upload the revolutions as before I do not know if when I washing it I did or has been the same theme of always. If a manual could happen to me or someone knows what I was talking about, I would appreciate it, because I took it to a "specialist" mechanic in Yamaha and literally scam me, I continued with the problem of starting that I suspected that it was the battery made me other windows I charged me 80 turkeys for nothing I lost gasoline. Greetings and thanks.