Advise: "go for it". When I got mine, I thought it was ready to roll. It was ready to roll into a junk yard in reality. While its a challenge, do what you can. Then next season do some more. And so forth. Eventually you will be just doing maintenance. But it will take a while. If you wait until
everything is perfect, you will NEVER get to use your st. There is no difference between single port 1600 cc engines. a bug is a bus is a st is a bandsaw- lumbermill...
really, go for it. just try to have someone (in their own cat) to travel with you, or know where to come get you.
If I were in your shoes. (oh wait, you are in my shoes) clean fuel tank, lines. make certain engine will idle. Will it restart. does the drive chains have proper tension. are the bushings so worn the track digs into the chassis on turns or it throws the track. if not ,get out and enjoy. Next season, list the items that need attention by how critical they are and start fixing them. Then enjoy. repeat as needed. Enjoy. Have I said enjoy? I ran myself into a hole a couple of years doing the "this must be done" before I use it. OK, so I had a few bad experiences at first. Then I helped another cat crew. Then I knew there were folks to help me as well. Develop relationships to other users. Make certain folks know when to look for you. Enjoy
Enjoy