Bombardier SeaDoo 2001 factory shop manual, Page 365Get this manual
Section 10 ELECTRICAL SYSTEM Subsection 02 (IGNITION SYSTEM)
Spark Plug Analysis
3Hand screw spark plug into cylinder head and tighten with torque wrench and proper socketA00E0AA
1Overheated (light grey) 2Normal (brownish) 3Fouled (black)
The plug face (and piston dome) reveals the condition of the engine, operating condition, method of driving and fuel mixtureFor 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) and the piston dome