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APPENDIX 16-3
Spark Plug Condition
Carbon Fouling Oil Fouling
Overheating
Nonnal Operation
Standard Spark Plug Threads
Diameter: 10 mm
Pitch: 1 .0 mm
Reach: 19 mm
Spark Plug Inspection
.Remove the spark plug and inspect the ceramic
insulator.
*Whether or not the right temperature plug is being used
can be ascertained by noting the condition of the
ceramic insulator around the electrode. A light brown
color indicates the correct plug is being used. If the
ceramic is black, it indicates that the plug is firing at too
Iowa temperature, so the next hotter type should be
used instead. If the ceramic is white, the plug is
operating at too high a temperature and it should be
replaced with the next colder type.
NOTE
0 The heat range of the spark plug functions like a
thermostat for the engine. Using the wrong type of
spark plug can make the engine run too hot (resulting
in engine damage) or too cold (with poor performance,
misfiring, and stalling).
Plug Reach