So I started tinkering with the old Bush Hog I bought a few weeks ago. It seems it has no spark. The first thing I thought I would do is figure out just what I am working with. Now I am professional automotive mechanic by trade so its not like I am totally clueless. But I have never fooled around with an old Wisconsin air cooled engine before. So I hit the old internet and I did find most of the info I will need diag its issues. But what I did not find was the relation of the engines numbers to production dates. The engine ID tag was in very poor shape and I had to remove it and polish it up just to read it. I am hoping one of our fine members can help me date this old hunk of iron and explain just what these numbers mean. Here is what I got.
S-7D 3909176 3 X 2 5/8 221127 Thanks in advance for any help you guys can offer. Jack..