Cub Cadet MTD P71 Series - Manual (Page 81)

Ignition System
75
Ignition module
The ignition system is a capacitive discharge ignition system, contained in a single module.
• The capacitive discharge has a three leg design.
• The magneto is energized by the passing of a pair of magnets mounted in the flywheel.
• Ignition timing is set by the location of the flywheel in relation to the crankshaft. Proper timing is main-
tained by a steel key.
Module removal
1. Unplug the spark plug.
2. Remove the recoil assembly by following the steps
described in Chapter 6: Starter.
3. Lift the fan shroud off of the three studs that locate it.
4. Unplug the wire from the spade terminal on the mod-
ule. See Figure 7.8.
5. Remove the studs holding the module in place using
a 10mm wrench.
Installing the module and setting the air gap
NOTE: If just setting the air gap, loosen the module
mounting screws first then follow the same
steps as described below.
1. Rotate the flywheel so that the magnets are away
from where the module is mounted.
2. Install the module. Do not tighten the module down.
3. Place a non-ferrous feeler gauge between the mod-
ule and the flywheel. See Figure 7.9.
NOTE: The air gap should be 0.012” - 0.020” (0.3 -
0.5 mm).
4. Rotate the flywheel so that the magnets align with
the legs of the module while holding the feeler
gauge in place.
5. Tighten the module mounting screws to a torque of
18.5 ft-lbs (10Nm).
6. Rotate the flywheel to remove the feeler gauge.
7. Install the blower housing and starter.
8. Connect the spark plug wire to the spark plug.
9. Test run the engine before returning to service.
Figure 7.8
Unplug the wire
Remove the studs
Figure 7.9
0.012” feeler
gauge