1999-2004 Honda TRX400EX FourTrax Service Manual, Page 228Get this manual
16IGNITION SYSTEM SERVICE INFORMATION TROUBLESHOOTING IGNITION SYSTEM INSPECTION 16-1
IGNITION COIL IGNITION CONTROL MODULE (ICM) IGNITION TIMING
16-6 16-6 16-7
SERVICE INFORMATION
GENERAL
CAUTION:
Some electrical components may be damaged if terminals or connectors are connected or disconnected while the ignition switch is ON and current is uresentWhen servicing the ignition system, alwaysfollow the steps in the troubleshooting on page 16-2The ignition timing cannot be adjusted since the ignition control module (ICM) is factory presetThe ICM may be damaged if droppedAlso, if the connector is disconnected when current is flowing, the excessive voltage may damage the ICMAlways turn off the ignition switch before servicingA faulty ignition system is often related to poor connectionsCheck those connections before proceedingUse spark plug of the correct heat rangeUsing spark plug with an incorrect heat range can damage the engineFor ignition switch and engine stop switch inspection, see section 18For exciter coil and ignition pulse generator (alternator stator) removallinstallation, see section 10