On my O.S. Max 40 engine, the throttle lever retaining screw came loose and prevented my engine from operating properly. After tightening the screw, it worked fine for one day. The second time I went to fly, the engine stopped shortly after starting and also in mid-air resulting in a dead stick crash with no damage. Why does the carburetor not have the same opening every time I move the stick to the low position? Sometimes the opening is smaller then needed to idle the engine and when this happens, the engine shuts down to disastrous results.

I contacted O.S. and they said that I need to either flush the carburetor with fuel or get a new one. Does this make sense? It was hard to get it out of them, see a little difficult to work with.

Thank you for your help in this matter.