Thanks reddragon, I tend to think you are right on this issue of the ignition. Have been out this morning early before the heat set in to check things out. Mower does everything perfect in the cool of the morning. Starts, restarts numerous times with no problem. Will not co-operate in 100 degree weather. My neighbor (owner of mower and 82 years old) doesn't need to be out in the hot part of day anyway. I will tell him it is a safety feature so mower does not overheat. HA! HA! Been working on all his lawn equipment for the past three years, at no charge of course. Its a learning experience for me and a money saver for him. Win, win situation for us both. I will go out later when it is in the high 90's and try everything again. Thanks for all the help and will let you know how things turn out. When I learn to navigate this site I will PM you instead of posting. Thanks again for all the advice. Will be in touch. woodfar