I just picked up a '92 Moomba Boomerang w/ 5.8 HO Pro Boss Pro Tech w/360 hrs on it. I like to do all the maintaince myself and I am unfamiliar with this set-up and I am trying to read up as much as possibe. In the past I had a couple of Mercruisers and a few big block jet boats and I did all the work to those.
First thing is I dont know much about the motor, how much hp is it, the PO thought 325hp but that seems high to me. Do the motors have roller cams or should I run an oil additive for the flat tappet cam? Also, a there somewhere to get service manuals?
Second, is there any type of maintaince to do to the prop shaft where it exits the bottom of the hull, like seal wear, greasable bearings/u-joints, tolerances for shaft play?
Third, is there something I need to do for the impeller that feeds lake water to the cooling system of the motor? Our lake I am on is very sandy if it makes any difference.
Fourth, maintance for the transmission, anythng I need to do periodically?

The boat runs/drives perfectly and has great acceleration and handles really nicely. My 6 year old loves it because it is so shallow he can reach the water and gets occasional spray from waves. I just want to keep up the boat and right now I really don't feel confident working on direct drive specific components.