78/83/90 Series Horizontal Shaft Engines
84
Test for ignition that won’t turn off
MTD engines are turned off by removing the spark from the engine. This is accomplished by shorting the primary
windings of the coil to ground.
If the engine does not stop when the key is removed
and/or the throttle is moved to the stop position:
1. Test the stop switch and the remote ignition switch
by following the procedures described in the previ
-
ous sections of this chapter.
NOTE: If the switches are working properly, leave
the front engine shroud off.
2. Remove the blower housing.
3. Move the throttle to the wide open throttle (rabbit)
position.
4. Connect one lead of the multimeter to one of the
wires that goes to the remote switch.
NOTE: One wire will go to one of the module
screws to provide a ground path. The other wire
goes to the primary winding of the coil.
5. Set the multimeter to the ohms (Ω) scale.
6. Connect the other lead of the multimeter to a good
ground.
See Figure 7.8.
7. Repeat steps 6 - 8 on the other wire.
See Figure 7.9.
• The ground wire should have a resistance read-
ing of 0.2 Ω or less. If the reading is > 0.2 Ω,
check the ground at the module and check the
wire for a fault.
• The wire that goes to the primary windings of
the coil should have a resistance reading of
approximately 1.0 Ω. If the reading is >1.2 Ω,
replace the coil.
Figure 7.8
One of the
Coil reading
wires
Figure 7.9
Blue wire
Ground reading
Ground wire
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