ORIGINAL: FLYBOY
Make sure your head bolts are tight too. If it just quit and has no compression at all, it sounds like you have a problem. THey don't normally do this. If you have had a few in a row do it, you must be running them way too lean. I have seen a lot of guys run engines really wrong, and I have never seen one just stop all of a sudden have no compression. It can happen, but it would be odd to have it happen a few times in a row.
I had a piston come apart one time and the engine still had compression and ran. These little engines take a lot.
Check to make sure your bolts are tight, your plug is tight, and that your fuel is good. If you run bad fuel, it could damage the engine. How old is the fuel?
the fuel was just bought from my local hobby store, its morgan 10% and works well with my other engines, I removed the glow plug from a good running motor and tried that , and no change, whats odd is a good friend and club member said thats strange that last week he saw how stong that engine was pulling my plane and now it dies at full throttle on the bench and has a new fuel tank and tubing,I blew out the carb and cleaned it I sealded the needle with a pice of fuel tubing, I Rtved the carb gasket area, this may sound stupd, but could my Idle adjustment screw have turned out or in and caused this problem?