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SPARK TEST

Test for spark using an in-line spark tester. The spark should be consistent and jump
a 6mm gap. It is possible that an ignition coil can break down under heat or heavy
load. Test the spark after engine is warm and under slight load. If there is spark,
move to the next test.
If there is no spark, check:
 Spark plug. Use only the spark plug specified in the service manual. Other brands
may not function properly or the cross-reference may not be exact.
 Proper installation of the coil – the coil should be set at the specified air gap and the
correct side of the coil should be facing up.
 A good ground between the coil and the engine block. When using an Ohm meter,
there should be no more resistance between the coil and engine block than when you
touch the meter test leads together.
 Ignition coil resistance values per the service manual, or try replacing the coil with a
known good coil.
 On some V-Twin engines like the FH series, the coils are connected by a kill circuit
wire. A failed diode in one coil will prevent the opposite coil from firing. Replace
the coil with the failed diode, eventhough it still fires it’s plug.
 Igniter. Some earlier Kawasaki engines have an igniter that is separate from the
ignition coil. On newer engines, the igniter has been incorporated into the coil. Make
sure parts from these “old” and “new” styles have not been mixed.
Some FD engines have a transistor battery ignition. This means that the battery is
necessary to power the ignition. On these engines, also check:
 battery condition. With no load, the voltage should be 12.4 VDC. Use a load tester
to test the battery’s capacity. Follow the instructions on the tester.
 That battery power is getting to the ignition
 Test the following components by either the resistance values in the service manual
or replacing with a known good part:
 Igniter box
 Pulser coils mounted by the flywheel
 Delay relay. If so equipped, this disconnects power to the ignition system after
approximately 1.5 seconds. There are no resistance checks for this component,
but it can be bypassed easily.