On the 1972 CB 750 model as mine is, the emblems are held on by pins
from behind the emblems with small clips on the pins. To remove these
I use a flat putty knife to pop off the emblems. Be carefull not to
damage the Honda emblems because they are not replaceable any more. I
use paint striper on the emblems amd removed all the old paint and
then polished them to a nice chrome look, and I didn't want to fuss
over trying to repaint them every so often.