I am new to four stroke engines and I am encountering a problem that I have not had with 2-stroke engines. I have a Great Planes Cessna 182 with an Enya .53 4-stroke engine. The engine starts up and runs beautifully but it keeps kicking the prop and spinner off. When ever I think I get it running just right and I take off it throws off the prop. I have an on-board glow plug heater on my plane, could that be creating a problem? Its running a little on the rich side, but when I try to lean it out it still kicks off the prop. I need some advice from you seasoned folk here. I am using Enya #3 plugs and Cool Power 15% fuel with Castor. The Prop is an 11X7. Also is there a way to secure the prop so it doesent come off when the engine backfires. I really get tired of having to search the fiel for my prop and aluminum spinner. So far I have been lucky enough to find it everytime it throws it. I am almost ready to put my TT .40 pro on it.