User Manual

PAGE 14 OF 22
This plug looks about right. On
disassembly, notice the black
mixture ring in the isolator
shoulder.
Plug 1 is slightly lean, as
indicated by the head
temperature.
plug 2 is slightly richer, the
black ring still is not as high as
1/4 isolator length
plug 3 is too rich. The black
has crept up to 1/3rd isolator
length.
plug 4 is too rich, but heat
range is OK (champion DJ7Y)
Plug 5 is too lean (no black ring) It also is too cold (champion DJ6J black nose)
plug 6 is right mixture as shown by mixture ring, but too cold.
The head temperatures are quite high, because measurements were made on a stationary test stand. In
a plane, with baffles installed, temperatures drop 20 - 40 degrees.
Very clearly documented information from TSR:
http://tsrsoftware.com/read-plugs.htm