The Dutch are true velo connoisseurs. Their tradition of arranging outrageous races with the friction driven machines around obscure, tiny, never-heard-of-before villages is top$-solexmanship. Furthermore, the Dutch have amassed a great deal of esoteric knowledge on the fine art of tuning solexes.
Watch as these guys are pushing the outside of the envelope:
Giant Centipedes is a reckless Copenhagen-based moped touring gang grinding neighbouring countries in great fumes of two-stroke oil. They ride French VéloSoleX 5000's from '71 - friction driven mopeds with the engines placed on the front wheel.
In '08 Giant Centipedes made it to Stockholm and Oslo, in '09 to Krakow, Berlin and back. In '10 their plan is to ride the French machines 'round Iceland.