4 stroke maintenance

[catman115]

First off, I hope everybody had a wonderful holiday. Christmas evening I was talking with 2 of my boating brother in-laws. Santa dropped off a late model Stiegercraft chesapeake 25 to one of them. It came with a 200hp Mariner, He wants to use that as an anchor and buy a new larger power plant. (yamaha).. I said "check out the 225 yami 4 stroke".quiet,sips fuel etc. My other bro in-law said the maintenance on the 4's is much greater than the 2's. ie: the valves have to be adjusted frequently and other things.
This is my question:: Is that true ? do the 4's require more attention ? more $$$ each season. Don't the new 2 stroke yami HPDI motors exceed emission requirements ? I would like to tell the Stieger owner any feedback I can. Thanks