Looking at these pics really intrigued me. Because I really didn't know what I was looking at. Before this, the only thing I knew about engines was that I had to add oil to the gas for a 2 stroke. After seeing your pics I got myself a quick education from a local mechanic. I now know the very basics and differences between a 4 stroke and 2 stroke engine. So Thank You. I can now look at these pics and not feel completely stupid.