Those links to parts finders dont work, Im sure it has something to do with the cookies it sets on your computer, which dont make the link.
Its number 7, the screw with the spring.
Im not sure if this pic will work or not.
Reading the color on spark plugs isnt that meaningfull or easy. Modern gasoline, manditory additives, and not knowing what jet you were using (pilot, needle or main), plus the correct way to read a plug is by looking way down inside, and observing the location of the smoke ring. You can read more about it here. http://www.dragstuff.com/techa...ading-spark-plugs.html
or <a target=_blank class=ftalternatingbarlinklarge href="http://www.strappe.com/plugs.html
Id just worry about the symptoms , and jet accordingly.
If the head pipe gets red, either its running lean, or youve let it idle too long, with out cooling air flowing past it.
As long as youre working on the carb, replace, or completely clean the pilot jet. Which means removing, and cleaning with a carb cleaner(sometimes for hours) and reinstalling. Its easier to just replace it if you suspect its plugged.