plugs and plug reading

I blued the timing mark so it would show up in the picture . It will actually look to you as a faint blue line just like when you heat a piece of metal barwith a torch  and it cools where the heat stops it draws a blue line this is the same on the plug. notice the metal body is colored all the way around and is not black and stops at the second thread. the actual fuel mark on the ceramic is up in the plug I will cut the metal body off to show it latter . Maybe it will show up in the pic.

 

Three Saturdays ago I was trying to get my old chainsaw to run when she came out to call me to eat. She took one look at me yanking on the rope several and said its the spark plug. I said I checked it twice and it has good spark. She said it is always the spark plug come on in and eat. I went to tow the next day and bought a new spark plug and spent under two dollars and when I got home and put it in, it ran like a new saw.