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Trouble shooting the ignition system
The purpose of the ignition system is to provide a spark
in the combustion chamber at the proper time to ignite
the fuel/air mixture. The first step in troubleshooting the
ignition system is:
1.
Examine the spark plug(s) by following the steps
described in the spark plug section of the chap-
ter.
2.
Test the ignition system:
After examining the spark plug reinstall it, or a new one
to ensure a good spark plug is being used. Now the
ignition can be tested to verify spark is getting to the
spark plug. To test the system:
2a. Disconnect the spark plug wire.
2b. Connect a spark tester to the spark plug
wire.
2c. Connect the other end of the spark tester to
the engine block. See Figure 7.1.
Figure 7.1
CAUTION: Never remove the spark plug and
hold it against the cylinder head to test for spark.
The fuel/air mix coming out of the spark plug
hole will catch on fire.
NOTE: It only takes 1,000 volts to jump a .025"
air gap in open atmosphere, it takes 10,000 volts
to jump the same gap at 120 psi, therefore an
open air spark test in not valid.
CHAPTER 7: IGNITION SYSTEM
Spark tester
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Chapter 7: Ignition System
NOTE: The spark should be a minimum of 10 Kv
(10,000 volts) at pull over speed.
2d. Squeeze the safety bail and pull the starter
rope. Watch the spark tester. If sparks are
seen in the spark tester, the ignition system
is working.
NOTE: If there are sparks present in the spark
tester, check the spark plug again. If it is wet the
spark plug is defective. If the spark plug is dry,
the problem is not in the ignition system. Check
the engine's compression.
2e. If no sparks are seen in the spark tester fur-
ther testing is required.
3.
Test the stop switch:
NOTE: the stop switch could be mounted near
the carburetor or if the engine is equipped with
an engine brake, the stop switch will be located
on the engine brake. The switch is designed to
ground out the module.
To test the stop switch:
3a. Locate the terminal that connects the stop
switch wire to the primary windings of the
ignition module. See Figure 7.2.
Stop switch
Figure 7.2
Wire to
ignition model
67
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Table of Contents
Troubleshooting
