I came across a load of scanned Service Bulletins for Z1s and Z900s.

Have combined them into one WORD document which is now available to download if you need it - on my rebuild website.
Get it from the Manuals & Info link if you go via the Home page... It is just below the Z1 Service Manual link
or just click here - http://www.zedrider.co.uk/manuals--info.html
95 pages worth, file size about 14 Mbytes so it will take a couple of minutes to download - but you can save it once you have it the first time.
I'm sorry all the pages are not quite ordered right in a couple of places but it's taken me ages to get this far. If you scroll through it the pics give you a fair clue of what the issue was anyhow.
Hope they will be of some help to folks on here.
Think Ted & Taffus are working on a better set for the future... not sure these are the complete editions... but they cover a lot of problems that get discussed on here e.g. Reg/ Rect issues. Smokey Exhausts etc.
Cheers from Mark