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Snoop around the above link for a genuine Suzuki service manual, pdf form for $10USD. As far as carb rebuild kits I don’t think Suzuki offers one, you need to buy each individual part IF they are still available.
Search or ask on the Honda section of this form, a few members have been buying Honda parts from a website in Japan. They seem to have a better selection especially for older engines than the North American market. I’ve been on that website and I’m pretty sure they also sell Suzuki Marine parts.
The above link might be worth investigating, there is a few members from Australia that might point you in the right direction.