I have a 2014 Sportsman 570 w @ 3k miles on it. it’s been loosing compression and has been getting progressively worse over the couple summers I’ve had it since new. It had hard start issues the first year I bought it. I finally diagnosed the problem down to valve lash. My question is this. How can valve lash decrease? The cams have zero gap between the lobes and valve bucket/shims. I am 100% this is the issue. I have checked it with feeler gauges to confirm and if I loosen the cam girdle it gets more compression. Can someone explain this? Has anyone seen this happen before? This seems counter intuitive to me. It’s like the cam lobes are growing over time.