I own a two wheeler of suzuki make(fiero 2002 model).pls help?

I own a two wheeler of suzuki make(fiero 2002 model)the problem is that when i drive, it dosen't take quick pickup,i always feel like it's holding back,and when i try to accelerate, suddenly it stops or tends to go in reserve mode even though the tank has enough fuel in it.Recently i had changed it's clutch plates set.Is this going to be a major problem (is it CDI problem).Pls suggest,desperately needs help.