I have a Gardsman rotovator, which I was hoping to bring out of retirement this weekend, unfortunately I couldn't get it started, it was running when I put it away a few years ago. Is the 25thou gap universal to all rotovators, a new plug has been installed, but I couldn't remember the gap. Sorry this doesn't contribute to the above query, but I didn't know where else to put my question. Thanks, Mirita.