Before I got carried away with the tear down, I wanted to take pictures, as commonly advised. These next few pictures are represent the exact parts sequence in which they were removed.
IHCC 125 K301:
Muffler brace, secured by two head bolt studs, ie: nut and lock washer. The cap screw to the bottom left of the brace secures the muffler to the brace.
Here, are the three nuts, and three lock washers that secure the fuel tank support to the top of the head, above the head tin.
This was the picture after the muffler brace is removed. Note the tall, 3/8ths spacers.
Here is the top view, of the components left after removing the head tin.
Note: Under each of the 5 head bolt stud "long" spacers, is a nut and a thick, flat washer, and the head itself.
Now, I'm ready to clean and inspect all this hardware!