Rings are not a fashion item... they are a NECESSITY... you run a chance of damaging the piston if you are running it with no rings... (burning mixture blowing past the piston skirt).
Wait till you get the rings and install them correctly before running it.
How to install them correctly?
see the word "resources"?
click on that
then click on "articles'
then read "How To Fix Your Moped"
and scroll down for the answers on how to do that stuff