If you want more info join the yahoo group "Tokyo Riders" or "Gaijin Riders" who know all about this stuff, especially if you're new here and don't speak Japanese (yet).
mail : Tokyo_Riders(at)yahoogroups.com
website : (I'm not allowed to post URLs yet so you'll have to add the first bit yourself) groups.yahoo.com/group/Tokyo_Riders/
Hope to see you on the road some day if you're down Mt Fuji way.
Simon V