Dear OS,
I have a 46 FX engine . Its about two years old now have made over 50 flights. The problem with my engine was that it use to get over heated in a very short run and use quit in the flight . My instructor told me that their might some sort of gumming maybe in the crank case with which a such a problem is occurring.

I opened the engine and took out the bearing . I found that their was a bearing ball missing in the front Crank shaft bearing. Very Surprising to me. Now I have changed the bearings.

For a few days it worked well but now again a similar problem . The engine has excellent compression when cold but after some time it loses the compression when hot.

What should be the problem?

Thanks

Sharad