Rocketsled,
You are sounding more and more like a 4-stroker.
I put 27 hrs on my new rotax motor took it in and all it needed was a ring total cost $100. I will be sending in my motor soon to get refreshed and I will ask for:
new ring, piston, check the bottom end seals, reeds, etc and expect a cost of ~$300 That is after I put 30 hrs total on motor this yr.
On my first rotax motor took it in after 20 hrs and all it needed was a ring. The next summer the crank went and it cost me $400.
So it can vary. As to like wrenching on the motor, that is not for me. That just drives up the costs