MTD Engine - Series 350/450/650
10
5.52. Run and test the mower in a safe area before
returning it to service.
5.53. To test the stop switch: locate the terminal that
connects the stop switch wire to the primary
windings of the ignition module.
See Figure 5.53.
5.54. Connect an Ohm meter between the terminal
and a ground point. The reading should
approach zero when the bail is released, closing
the contacts. See Figure 5.54.
5.55. The reading should be high when the bail is
pulled down, reflecting the resistance in the pri-
mary windings of the ignition module.
See Figure 5.55.
5.56. Alternatively, a jumper wire could be connected
to the same locations. Use a commercially
available spark checker to see if the ignition is
working or not.
• If the jumper disables the ignition, but releasing
the bail does not, the problem lies in the switch.
• If the jumper does not disable the ignition, then
the wire that connects the switch to the ignition
may have a fault, or the ignition module itself
may be faulty. Further investigation is required.
• If the problem is a lack of spark when the bail is
pressed against the upper handlebar, disconnect
the wire from the switch using a 7mm wrench.
Isolate the wire from incidental contact with
ground, and test the ignition.
If it fails to spark, the wire may be shorted or the
ignition may be at fault. Further investigation is
required.
Figure 5.53
Stop switch
ignition model
Wire to
Figure 5.54
Ground connection
Stop
switch
connection
Safety bail in
OFF position
Figure 5.55
Ground connection
Stop switch
connection
Safety bail
in RUN
position
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