1. Get yourself a palm type sander, with some sandpaper and go to town on that motor of yours. It will come off.
I have helped polish more than a few newer sportbike frames ( same idea) . You would be surprised what some
sandpaper and alittle elbow grease will do..
2. I am not sure about your bike, but my factory front fender (1972 CB750k2) had a brace built into it. I removed the fender
from the brace, and kept the fender off. Pics in my gallery.
Welcome to the site, lots of good info here............ 