ORIGINAL: scratchonly
You can reduce the end play of your barrel by tightening the spring loaded barrel guide screw; be sure your throttle opens and closes without stalling your servo. Besure your throttle control rod is not pushig the barrel inward.
It is good idea. Thank you, I'll double check that when I'll get home. Unfortunatle, I still can not figure out why engine works fine for 5 min and then quit.