1986-1991 Kawasaki 650 X-2 Service Manual, Page 133Get this manual
ELECTRICAL SYSTEM 13-21 Spark Plug Cleaning
-Clean the electrodes and the ceramic insulator around the center electrode with an abrasive blasting deviceaBe certain that all abrasive particles are removed from the plug-Clean the entire plug in high flash point solvent
Spark Plug Adjustment
-Measure the spark plug gapCCheck the distance between the electrodes with feeler gauge or wire gaugeA.Notch BTiming Mark
-Shut off the engine
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aDo not run the engine for more than 15 seconds without cooling wateroTake care not to over-rev the engine while running it with no loadSPARK PLUG GAP
Spark Plug Gap