I'm not sure if this has to do with the shaft drive, but when I close the throttle quickly, there is a quick chirp, almost like a tire chirpping the gears. It's fast, I know it's not from the tire. Is it normal for shaft drives to have this symptom?

 

As far as i know, this is normal. My M50 does the same sound bothered me at first, but as long as I know is normal, I'm ok with it.