I bought a used YBRG 18 model. Engine seems fine according to mechanic, no black/white smoke.
1. The problem is it starts missing after 6 rpm and barely goes to 7 rpm on 5th gear (straight road).
2. I noticed that its throttle works till around 75-80%, above that it gives low pick/sound/rpm like if it is at 60%.
KNOWN PROBLEM:
Clutch plates needs to be replaced. (but it has nothing to do with throttle)
PLEASE GUIDE ME ON THIS ISSUE 
