I went out to the barn this morning and found the tailpipe did have two bolts. One came out hard and the other broke off. The spark arrestor was completely sooted up! I cleaned it, got the broken bolt out, cleaned up the threads in the muffler and the one good bolt and found another bolt in my collection and put it back together. They way I will be using this just putt putting around the yard and house and running between shops, I probably should clean this very regularly. With new bolts and a little Neverseize on the threads, it wouldn't take more that 5 or 10 minutes and I'll bet it runs better. The next time I do it, I'll stick the shop vac in the hole and vacuum anything in there out.
Thank you for the help.
Peter