Tore into my 87 non runner today. I have a couple questions about the cam, head and cylinder. First the cam, is it normal to have the discoloration? Mine looks shiny at the lobe ends but possible the hardening has wore away some? My cylinder head has a lot of carbon build up. I am guessing by the score in the cylinder that it's burnt oil? Does the head look serviceable? Lastly, the cylinder has a good sized score on the intake side. Probably from not servicing the air filter or possibly from bottom end debris. I will find out soon. Can definitely feel the score with your finger. Does that look like a stock piston?