1998-2004 Honda Foreman 450 factory service manual, Page 377Get this manual
18IGNITION SYSTEM SYSTEM DIAGRAM SERVICE INFORMATION TROUBLESHOOTING IGNITION SYSTEM INSPECTION
18-0 18-1 18-3 18-4
IGNITION COIL IGNITION PULSE GENERATOR IGNITION TIMING
18-7 18-7 18-8
SERVICE INFORMATION
GENERAL
If the engine must be running to do some work, make sure the area is well-ventilatedNever run the engine in an enclosed areaThe exhaust contains poisonous carbon monoxide gas that may cause loss of consciousness and may lead to deathRun the engine in an open area or with an exhaust evacuation system in an enclosed areaCAUTION: Some electrical components may be damaged if terminals or connectors are connected or disconnected while the ignition switch is on and current is present When servicing the ignition systemalways follow the steps in the troubleshooting sequence on page 1B3 The ignition timing does not normally need to be adjusted since the Ignition Control Module (ICM) is factory presetThe ICM may be damaged if droppedAlsoif the connector is disconnected when current is flowingthe excess ive voltage may damage the moduleAlways turn off the engine stop switch before servicing faulty ignition system is often related to poor connectionsCheck those connection before proceeding Use spark plug of the correct heat rangeUsing spark plug with an incorrect heat range can damage the engine