Service Manual

Section 8. Electrical
~WARNING~ incorrect service or replacement of
parts can result in severepersonalinjury and/or
equipment damage. Service personnel must
be
qualified to perform electrical and/or mechani-
cal service.
IGNITION SYSTEM
Refer to Figure 8-1. The ignition coil produces a
high voltage pulse that fires the spark plug each rev-
olution of the engine when the magnet in the rim
of
the flywheel passes across the pole faces of the
ignition coil. The ignition circuit may include a
throttle plate switch and/or a
low oil pressure cutout
switch.
FIGURE 8-1 TYPICAL IGNITION SYSTEM
Spark Plug
REMOVAL:Clean the area around the spark plug be-
fore removing it. Remove the spark plug lead from
spark plug. Remove the spark plug from the cylin-
der head.
Inspection/Service Check or replace spark plugs
as recommended
in the Periodic Maintenance
Schedule
(located in Operator's Manual). Replace
spark plugs that show signs of fouling
or electrode
erosion.
Installation Refer to Figure 8-2. Set spark plug
gap to that specified in
Dimensions and Clear-
ances.
Never assemble a cold spark plug into a hot cylinder
head.
Tighten spark plug to the torque specified in
AS-
SEMBLY TORQUES.
FIGURE 8-1. SPARK.PLUG GAP
8-1