Mad rocka: Did not notice you are out of country. If you would like I can get you the phone number of Larsen Marine in Wakegon, IL. They also have a web site you can go to. I saw the engine last year at the Chicago Strickly Sail show and was impressed. If it is a 2GM series, in a Hunter 31. Yanmar has a new engine around 23 HP. It is the same engine you have now, but with all the new bells and buttons, bigger pistons and more horsepower. Hope this helps. Don't have much information on used engines or where to direct you to. My opinon on used engines is: "You get a used engine and don't know it's history, or whether it is worth the time and money to put one in". I own some auto repair service shops and that has kept me from some sticky situations in the pass several years. Good luck.