Cub Cadet 2000 Series Professional Shop Manual page 110

2000 Series Tractors
Once the starter motor spins, we still need spark and fuel
to make the engine run. Looking at the circuits that do that:
1. The ignition sparks are generated by an ignition
module. The ignition module will work as long as the
primary windings are not grounded. With the key
switch in any position other than off, there is no con-
nection between the M (Module) terminal and the G
(Ground) terminal. See Figure 7.17.
NOTE: In ignition systems that have breakers to
cause the magnetic field to collapse, the coil
is called a magneto. In systems that use solid
state electronics to collapse the field, the coil
is called an ignition module. However, the
term "magneto" is used by some to refer to
both coils.
2. There is an afterfire solenoid on the carburetor.
When it is energized, fuel flows normally through the
carburetor. When it is not energized, it closes off the
fuel flow through the main jet of the carburetor. The
purpose of the solenoid is to prevent unburned fuel
from being pumped through the engine after the igni-
tion is turned off. This unburned fuel accumulates in
the muffler and may ignite with an alarming noise.
See Figure 7.18.
104
Primary winding
ground wire
Ignition module
Figure 7.17
Figure 7.18
Magneto
Afterfire sol.