AFAIK you need current named owner, or at least his/her ARC. If not available then very difficult to transfer ownership.
Bike needs to pass easy mechanical inspection; assume you wouldn’t buy anything that would fail anyway.
You need to go, or at least lend your chop to the person who does go. You go to your local DMV (same place you take the licence test). Don’t know where you are, so can’t tell you which one.
I think you need to renew the insurance at that time as well- pretty easy as there should be at least one insurance shop on or by the DMV site.
Although the Taipei county DMV website says you need to bring your motorcycle licence as well as insurance certificate, Taichung DMV dosn’t seem to enforce this. I’m licensed anyway but I know people who aren’t and who’ve transferred ownership without problems.
What bike is it, out of interest? My Yamaha SR150’s still going well although a little noisier than before since I’ve been driving it too hard and for extended periods (going up Hohuanshan, for example).