So a couple years ago I was using my SC to rake some hay. During that the tractor developed quite a miss and I ended up parking it until that winter (2020-2021). When winter hit I took the head off and discovered a broken piston on the number 3 cylinder (which I had had a problem with in the past not running when not under load). So I replaced the piston and put rings on all 4. I took the head to an engine shop and they ground the valves and seats. This summer I reassembled the engine and after some issues with me figuring out how to get the mag in time it ran just like it did before I took it apart, not running on number 3. So a friend of mine looked at it and he discovered what he thought was a weak valve spring. If you pulled up on the spring with a screwdriver while running it would run nice and smooth on all 4, but if you took the screwdriver out it would go back to 3. So I ordered a new spring and installed it. Still doing the same thing. Any ideas? I'm getting between 95 and 100psi for compression on number 3 and 100 to 110 on the others. Any suggestions are welcome. Thanks.