Hello all, I just recently bought the 250rtc as my first bike ever and I learned how to ride on it and how to properly street it. But I have a problem with parts and a few other things with this bike now.

The first; The shifter shaft fell off on my bike and now I can't come down from third gear because my shift lever is loose and not functional. Can I reverse fit a shifter shaft from another motorcycle onto this? And if so; which bike make and model? If that doesn't work; where can I go to buy the appropriate part?

Second: My throttle response is very poor. I'll twist the acceleration all the way and the bike only goes upto 3k rpms before it can't go anymore and then the bike just randomly stalls out. What's going on with that? Any possible list of symptoms and things to look out for?

Thanks in advance for all the help :D