Other information:
WARNING:
Batteries contain sulfuric acid and produce explosive gases.
Work in a well-ventilated area. Do not allow the battery to come in
contact with flames, sparks or burning substances. Avoid contact with
skin, eyes or clothing. Shield eyes when working near the battery to
protect against possible splashing of acid solution. In case of acid
contact with skin or eyes, flush immed..
Inspection
NOTE:
Dropped spark plugs should always be discarded.
Unfired
An unfired spark plug should appear very clean
with a pure nickel finish to the threads and ground strap. The center
electrode ceramic insulator surface is often a matte or dull finish and
pure white in color. The external primary insulator is often a polished
white ceramic with appropriate stamping ..