Somebody gave me a FOX 50. I went through it and checked everything, fired it up, set the needle, and took off. It died after a minute or so. After about 3 flights where it did the same thing, I popped in a McCoy 59 glow plug. Miraculous transformation!! Started easily, idled better, more power, and my hair grew back! (OK, my hair grows all the time anyway) Maybe it just needed a plug, but the McCoy 59 sure worked for me. (Fuel was 10% cool power.)