Re: Service manual
That I know, Nissan nor Tohatsu will sell a regular Tech Service Manuals to final end users, they are for Distributers/Dealers Use Only and are very technical. The owner manuals are supossed to offer related service issues that can be performed by owners. So would be a waist of time to complain direct to Nissan, they even won't bother to email you back. If in the need to ask a tech issue regarding your engine, just ask on this forums, that's the purpose for, help boaters to make their existance more easy.
Happy Boating