2006 Bombardier Outlander Max Series Factory Service Manual, Page 220Get this manual
Section 06 ELECTRICAL SYSTEM Subsection 02 (IGNITION SYSTEM)
Analysis
AOOEOAA
TYPICAL 1Overheated (light grey, white) 2Normal (light brown, brown) 3Fouled (black, wet or dry, dark deposits, grey, melted coating)
The plug face reveals the condition of the engine, operating condition, method of driving and fuel mixture For this reason it is advisable to inspect the spark plug at regular intervals, examining the plug face (i.ethe part of the plug projecting into the combustion chamber)