Yh i had that same problem only fixed it today, i cleaned the jets and the air filter but it still boged down so i put it on the stand full throttled it and it cleared out now its running fine
Yamaha Aerox 05
Polini Evo II Exhaust
Polini Variator, 3.9kg and 4.9kg rollers
Polini Kevlar Belt
Stage6 70cc Aluminium Head