I am currently working on a 1982 GSX 750 Katana SZ restoration and after a month or more of fruitless searching for a shop or even aftermarket manual I was put in touch with e-Classicbike.com http://www.e-classicbike.com/ in New Zealand. Stephen was able to set me up with a very comprehensive manual made up of a reprint of all 1980 to 1983 GS750 series shop manuals including my 82 Kat. Cost was around $50 including shipping.
On receiving the manual, I contacted him again to ask permission to spread the word and he is most willing to try and source whatever you might be after. He did mention that he specializes in Hondas.
If you are searching for something drop him a line.
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