Thoughts and Suggestions:
1) 'General Bike' should stand alone as it generates the most volume (13,500 topics or so).
2) 'Random Thoughts' and 'Other Forums' can easily be combined since so many cross topics already exist in both.
3) 'Top Speed', 'Turbo', '1/4 Mile', 'Twisties' and 'Racing Tech' seems almost redundant. Maybe these can be combined in one "Performance" forum.
4) 'Tech' should not include 'New Owners FAQ' in my opinion since 'New Owners FAQ' isn't really tech.
5) 'New Owners FAQ' should be a stand alone forum at the very top of the list and could contain all the lovely sorts of 'TRE' questions.
6) 'Products and Classifieds' also seems well organized. Leave it be.
7) A hostile issues room is not a good idea - in fact it's a lousy idea.
8) A Liter bike forum will quite likely bring in all sorts of riff raff 'garbage' newbies and give Rubbah apoplexy.
9) I must be some sort of fricken genius because I've never had a problem using the 'search' function.