2005 Kawasaki KAF620 Mule 3010 Trans 4x4 Service Manual, Page 351Get this manual
ELECTRICAL SYSTEM 17-25 Ignition System WARNING
The ignition system produces extremely high voltageDo not touch the spark plug, high tension coil, or spark plug lead while the engine is running, or you could receive severe electrical shock
CAUTION
Do not disconnect the battery leads or any other electrical connections when the ignition switch is on, or while the engine is runningThis is to prevent IC igniter damageDo not install the battery backwardsThe negative side is groundedThis is to prevent damage to the diodes and IC igniter
Spark Plug RemovalInstallation
Remove the spark plugs with Hex19 long type socket wrenchTighten: