Engine tune up

[Steveo]

How often should you do a tune up of your engine (boat). In the past with my old boat (1988) I would do every other year (40 hours per year). I now have a 2008 and was wondering what is the rule of thumb for hours, years, etc. I change all fluids, filters and outdrive fluid every year but was wondering about the tune up

Thanks

[BroadHopper]

Today's engine can go 300 hours between tune ups. If you use the more expensive iridium spark plugs.

[dave603]

Just did our boat after three years. Almost close to 225 hours.
Didn't seem like it needed it, was running great, but I prefer to not have problems mid-summer.

[DesertDweller]

I do plugs every other year. Probably not necessary but I have an outboard and it's pretty easy to do.