The Honda Sandcast forum is a good example of a great resource utterly trashed by corporate greed pulling all the photos, it’s not like those bikes are going to get rebuilt a second time, they really are gone forever.
As far more of these bikes went to the States, it’s not surprising that this is where the knowledge base is, however I can’t believe how many people think they know better than Honda engineers, and for example throw away, or never bother buying, their feeler gauges and timing lights and do everything by ear, because that’s how Pappa always did it. There is much on the twins forum that should be taken with large pinches of salt therefore.