I have a 98 20hp walker MTSD. Went to start it this morning and the beep and lights came on but when I turn the key to start it nothing happens. I have checked all the safety switches I can think of and still nothing. Also I switched out the ignition with one of my other walkers and same problem. So it is not the ignition switch and the starter gave a spark when I was messing with it. Any ideas on what could be the problem, maybe there is a safety switch that I am missing?? Thanks!