Well, I put together a little wiki this week. Didn't spend much time on it, just something to do rather than working.
It's here:
http://motorcycles.wikia.com/wiki/DTT_Knowledgebase
I've set it up to have bike makes on the front page, click that to choose model, then add information if you've got it. There may be better ways to organize this, so feel free to change it up. As a wiki, it's open to editing from anyone. No account or login needed.
I filled in some info for Honda CM400 since it's my bike:
http://motorcycles.wikia.com/wiki/CM400
The other pages will have to be created and filled by other folks. There are links on the front page to directions for editing, feel free to ask me if you have any other questions. I'm no expert, I just hit the big "Edit" button at the top of the page.
It won't break my heart if this doesn't go anywhere, I only spent about 30 minutes on it. It could turn into a good resource though.
dan
Edit: one wiki pointer - if a link is red (like all the links except Honda on the front page), that means that it goes to a blank page. If you click that link, it will take you directly to the page editor where you can start typing info.