Bombardier SeaDoo 1998 factory shop manual, Page 227Get this manual
Section 08 ELECTRICAL SYSTEM Subsection 02 (IGNITION SYSTEM)
Spark Plug Installation
Prior to installation make sure that contact surfaces of the cylinder head and spark plug are free of grime1Using wire feeler gauge, set electrode gap according to the following chart2Apply anti-seize lubricant over the spark plug threads to prevent possible seizure3Hand screw spark plug into cylinder head and tighten with torque wrench and proper socket1 2