WANTED: Motorbike to teach neighborhood kids while not in school

Hi, I am looking for free or cheap bike/s to teach the neighborhood kids how to build, maintain and ride safely while they are not in school. Any bike, any condition really. Could even be a bike that has been out in a back field for many years. Scooters, dirt bikes, quads, sport bikes, cruisers, touring etc, doesnt matter. Would be awesome if there were papers but not necessary. Anything at all helps. Can pick up from any of the islands or lower mainland. Thanks so much!