Garret,I may have to agree with Pat on repower with a new engine....but, if you are on a budget, there is nothing wrong with repower your existing Yanmar. I did the same about 3 yrs ago when we bought our Catalina 30 - it came with a seized Yanmar YSM12. I pulled the engine and had a shop rebuild everything. She runs great and starts right-up. A little underpowered for my boat but then again, its an auxillary. I saved about 50% - plus it plugged right back into the boat.Depending on your mechanical ability...you may want to tackle a rebuild yourself. There is really not much to these smaller engines. If you know your way around a gas motor then go for it.Check out this site for Yanmar questions - excellent messageboards run by a mechanic.http://www.yanmarhelp.com/msgboard.mv Good luck!Rob