Thanks for all the help. My bad running Garelli was the result of a too-rich jet for the Puerto Rico heat/humidity. This then caused the plug to foul out. I've got two smaller jets coming in the mail that should solve the problem.
Lesson learned: If you are taking your ped to a new location, get some different size jets before you leave just in case.
Thanks too for "Fred's" info on how to fix your moped. Great info.