I had a problem with compression on my previous engine.</p>

When I installed it into a new plane, I went too go and test run it while taxing the plane up and down. I firstly made the mistake by doing it in very hot conditions with now wind too cool it off and the engine running inside a cowl. Secondly I didn't richen the engine too help with the cooling. After a min or two taxing it up and down and giving it a few "sprint runs". I decided I want too take her up and I went too refuel. Refueled and tried to fire the engine up - but nothing - no compression - nothing!</p>

Now the engine will start easily then start dying unless you play with the throttle, because of loosing compression. Once it dies, you will NOT get it running after about an hour.</p>

I think you are def running too lean. If the engine dies and you are capable of starting it with ease only a min or two afterwards, I think your engine may still be fine. If not - I think you will have to replace that sleeve and piston again.</p>