When I was growing up, I noted that when he finished mowing, Dad always closed the stop-cock on the fuel line and let the mower use up all the fuel in the carbeurettor. So when I acquired a mower of my own a little while back, I did the same. Always started fine the next time I went to use it. The only time it had trouble was after the one time my father-in-law used it. He *didn't* empty the carby. :-O

Wade.