I've found a really useful site for proper Honda parts diagrams:
http://www.cheapcycleparts.com/makes. It gives actual Honda part numbers that you can take to the likes of David Silvers and wemoto.
It is unfortunately in the US but in general the bike components are the same as the UK except for carb/fueling set up (especially for those crazy Californians).
I've been using it for the last few days to work out whether I can put the higher compression pistons from a CD185 Benly in my CD200.

And, yes I can... I blame tony.mon's rebuild thread for my ideas, though they may not be quite on the same scale... yet... Has anyone ever fitted Nos to a benly?
