> In Japan, when you get a license to ride a motorcycle, you're only allowed
> to ride one at-or-below the cc's of the one you took the test with.........

Here in California they have 2 classes of motorcycle license, M2 for
"149cc and less" and M1 for "all motorcycles". This apparently was
changed from the old "one M class" way because the "riding test"
involves riding 100 feet between two painted lines into a circle of
two such lines, around the circle 3 times (staying between the lines),
then back to the starting point between two lines leading from the
circle-- all of this without touching the ground with your foot or
going outside the lines. It seems that before the rule change, people
would do what my father and I did: leave the VFR750, Harley, or
GoldWing at home and take the test on a little 70cc trail bike! We
both could've passed on the VFR, but the CT-70 was so much easier, so
why take the risk of an stupid whoopsie...