Hello everyone,I am new here and found this place from hours of searching the net for some help. I have a coworker that has a Toro timecutter zero turn mower with a 21hp Kohler engine on it.He bought it new in 2008 and used it a couple years when it started vibrating and knocking. Long story short it has two cracks in the block and one bolt busted off.It has been sitting in his garage for a couple years and I am thinking about buying it.From what I have been reading this is a very common problem with the Kohler courage. If I can get this cheap enough is it worth getting a new Kohler or should I convert to a different brand? Motor spec is sv610-0200..He has e-mailed Kohler twice with no response.Is was just out of warranty when this happened. I cant find a used engine anyplace around here. What Kohler engine would I need,Dont look like they make this one anymore?