A year ago someone brought a AC 312 to my son, saying it would not run and could he fix it. It has a Kohler K301 and my son asked me to look at it as he has no experience with the older motors. The owner showed up win I was looking it over and told me he had loaned it to someone to mow with and he brought it back dead. I figured out it had thrown a rod, so I took it home to tear down and figure cost. When i got it home I found that the clutch pedal was rusted and would not move. We gave him a cost of $400 for parts and labor to rebuild it. He got back to my son and said he could not aford that and had a lead on a used motor. We don't have a phone number for him as he just stopped by my sons. We have not heard from him in over a year and my wife is getting tired of it setting in the back yard. The tractor is not in bad shape. I have had a couple of guys stop by and want to buy it. I don't know what to do. What advice do you guys who work on mowers, should I sell it or wait a while longer?