I am posting this question for someone that has been having a hot soak no start on an older simplicity 15 horse Briggs twin. I think the model was a 1548. He states that it runs perfectly but will not restart after a hot shutdown. He must let it cool, then it starts. He wonders if it has something to do with the ignition system because it doesn't seem to have a very hot spark. I have not seen the unit, so I can't add much. He said he replaced the coil assembly and it still didn't help. Any help would be appreciated, since he's been struggling with this problem for a while.