Ignition System - Service Information - Honda Nighthawk CB 750 1991 Service Manual

14. lgnition System
Service Information
Troubleshooting
System Inspection
14-1 Ignition Coil 14-6
14-2 Ignition Pulse Generator 14-7
14-3 lgnition Pulse Generator Removalllnstallation 14-8
14-6 Ignition Timing 14-9
Service Information
CAUTION
I
Some electrical components may be damaged if terminals or connectors are connected or disconnected while the
ignition switch is ON and current is present.
If the engine must be running to do some work, make sure the area is well-ventilated. Never run the engine i n
an enclosed area. The exhaust contains poisonous carbon monoxide gas that may cause loss of consciousness
and lead t o death.
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When checking the ignition system, always follow the steps in the troubleshooting flow chart (page 14-3).
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The ignition control module may be damaged if dropped.Also, if the connector is disconnected when current is
present, the excessive voltage may damage the ignition control module. Always turn off the ignition switch before
servicing.
The transistorized ignition uses an electrically controlled ignition timing system. No adjustments can be made to the
ignition timing.
.
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A rough diagnosis can be made by identifying the cylinder whose spark timing is incorrect.
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A
faulty ignition system is often related to poorly connected or corroded connectors. Check those connections before
proceeding.
Use spark plugs of the correct heat range. Using the wrong spark plugs can damage the engine. Refer to section 2 of
the Common Service Manual.
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Make sure the battery is adequately charged. Using the starter motor with a weak battery results in a slower engine
cranking speed as well as no spark at the spark plugs.
For side stand inspection, refer to section 25 of the Common Service Manual.
For neutral switch inspection, refer to page 16-8.
For the ignition switch and engine stop switch inspection, check for continuity using the chart on the Wiring
Diagram, page 17-1. Disconnect each switch connector inside the headlight case (page 1-21) ahd check
it.
For side stand inhibitor system instructions, see page 14-5 "N0TE"of the troubleshooting.