I am a new rider. This is my first bike. It is a 2005. I am wondering being that I pulled this bike out of Someoned trash pile. I have it running but I cannot get it to run quite right every time I get into the higher in RPMs, she starts to backfire, and then eventually stalls and dies. I have put new carburetor, new spark plug, Have a new spark plug wire and coil in the mail, replace throttle cable and handle, clutch cable and handle. What else can I do?