8.1
Section 8
Electrical System and Components
8
Section 8
Electrical System and Components
This section covers the operation, service, and repair
of the electrical system components. Systems and
components covered in this section are:
• Spark Plugs
• Battery and Charging System
• Electronic CD Ignition System (including SMART-
SPARK
™
on applicable models)
• Electric Starter
Spark Plugs
Engine misfire or starting problems are often caused
by a spark plug that has improper gap or is in poor
condition.
The engine is equipped with the following spark
plugs:
Type:
The standard spark plug is a Champion
®
RC12YC (Kohler Part No. 12 132 02-S). RFI
compliant engines use a Champion
®
XC12YC
(Kohler 25 132 14-S) spark plug. A high-
performance spark plug, Champion
®
Platinum
3071 (used on Pro Series engines, Kohler Part
No. 25 132 12-S) is also available. Equivalent
alternate brand plugs can also be used.
Gap:
0.76 mm (0.030 in.)
Thread Size:
14 mm
Reach:
19.1 mm (3/4 in.)
Hex Size:
15.9 mm (5/8 in.)
Spark Plug Service
Every
200 hours
of operation, remove each spark plug.
Check its condition and either reset the gap or replace
with a new plug as necessary. To service the plugs,
perform the following steps:
1. Before removing each spark plug, clean the area
around the base of the plug to keep dirt and
debris out of the engine.
2. Remove the plug and check its condition. See
“Inspection” following this procedure. Replace
the plug if necessary.
NOTE: Do not clean spark plug in a machine
using abrasive grit. Some grit could
remain in the spark plug and enter the
engine causing extensive wear and
damage.
3. Check the gap using a wire feeler gauge. Adjust
the gap to
0.76 mm (0.030 in.)
by carefully
bending the ground electrode. See Figure 8-1.
Figure 8-1. Servicing Spark Plug.
4. Reinstall the spark plug into the cylinder head
and torque to
24.4-29.8 N·m (18-22 ft. lb.)
.
Inspection
Inspect each spark plug as it is removed from the
cylinder head. The deposits on the tip are an
indication of the general condition of the piston rings,
valves, and carburetor.
Normal and fouled plugs are shown in the following
photos:
Wire Gauge
Ground
Electrode
Spark Plug
0.76 mm (0.030 in.) Gap
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