Finally got the tractor up and running last week after dealing with starting issues, although now it is in over 100 pieces once again. I have had a knock in the engine since I bought this tractor, and decided to investigate now instead of waiting till winter. What I found: cylinder 1 was/is missing the piston sleeve, (I found it at the bottom of the oil pan) cylinders 2-4 look great after pulling them. Initially my plan was to purchase the kit for all new sleeves, pistons, and the rings, but now after looking at my budget for this project I believe I am going to replace the one sleeve and the rings on that piston. My question is, what size sleeve do I get? How do you tell what size is used? Oh, my tractor is a 48 8n.