Appreciate some input on spark plug reading

Here ya go, think about these statements:

"When you measure the AFR of an engine and its in the 12's and the plug is white well then you have a vaporization issue like what Im talking about. Its not uncommon, in fact its the norm."
And

"The problem Im talking about isnt fixed with the carby. You may tune the carby so the engines runs good etc but what im talking about is not tuning a carby. A simple thing to undetand that most people dont observe is this. Anytime a substantially richer than stoichiometric mixture is burnt carbon must be deposited. What this means is if the mixture around the plug is rich then there should be carbon on the plug. Thats what the TAN coloring is. When the plug is white then it means that the mixture around the plug is lean of stoich. The condition of the mixture around the plug at ignition time is critical. If the engine doesnt gas enough of the fuel load at ignition time then the mixture around the plug will be lean of stoich, or leaner than the average of the chamber. When you swap carbys between engines, you get to see the differences between engines in how they energize the fuel prior to ignition. If one engine gives a different plug read to the other then thats what you are primarily observing, the difference in the combination's energy input to the fuel."

Good Luck....