needed - service for honda engine

A friend of mine needs a Honda boat engine serviced, the boat is moored in his own private marina in Tipperary on Lough Derg, so the mechanic has to be prepared to do the repairs on site.
I would be grateful for any pointers. I wouldn't know the finer facts of the case but for any more questions I can PM you his contact details.
Thanks a lot in advance lads!

Try some of these they might be able to help.

http://www.truelightmarine.ie/antifouling.html

http://www.shannonsailing.com/workshop.htm

or Mick Clinton "Clinton marine services" he is a sound man if he can help he will. Tel: 0873526810