Chapter 7: Ignition System
69
3h. Resistance (Ohms) should be infinite (O.L)
with the bail released. See Figure 7.6.
3i. If the switch and wire work properly, and the
connection is good at the spade terminal,
but releasing the bail or turning off the
switch fails to stop the engine, then the
problem lies within the module.
4. The module
4a. Normal performance of the coil is to produce
at least 10,000 volts at starter-rope pull-
through speed. See Figure 7.7.
Figure 7.6
Safety bail in RUN
position, Module
primary windings
not grounded
Figure 7.7
Inexpensive spark gap tester
provides usable information
4b. Presence or absence of strong spark, with
the stop switch and wire known to be good,
is generally enough to identify the ignition
coil as good or bad. Resistance readings
may help confirm the source of the failure,
but are generally meaningless because
they only measure a small part of the mod-
ule.
NOTE: Presence of a weak spark maybe the
result of an improper air gap. The air gap space
should be .008”-.016” (.2-.4mm).
4c. Simple spark-testers are readily available
and inexpensive. Thexton Part # 404 is
available from a variety of retailers, and
similar units are available form other manu-
facturers. See Figure 7.8.
Figure 7.8
Instructions on
back of package
www.mymowerparts.com
For Discount White Outdoor Parts Call 606-678-9623 or 606-561-4983
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