I have gotten to the point where I am going to have to replace the 20 horsepower Kohler on my 1997 Walker T model. Where can I get the best price on a whole replacement motor? Has anyone done this changeout themselves, and if so is it a straight bolt in replacement? I realize I will have to change over pulleys, muffler, etc. Any tips from those of you who have gone through this would be appreciated. I don't feel it is reasonable to pay a dealer $2000+ to do this job when I know I can do it myself.