I changed the gearbox oil, replaced the throttle and kill switch (that’s been on my list for a very long time), and cleaned the air filter (first time I’ve ever done that; it wasn’t all that dirty). I also checked upstream and downstream of the carburetor for a restrictor plate and couldn’t find one, so I guess that’s already been removed. Makes sense, since this bike is pretty powerful.
To disable the X Window System on Fedora 23,
systemctl set-default multi-user.target
systemctl set-default graphical.target