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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 Plug
• Battery and Charging System
• Electronic CD Ignition System
• Electric Starter
Spark Plug
Engine misfire or starting problems are often caused
by a spark plug that has improper gap setting or is in
poor condition.
This engine is equipped with the following spark
plug:
Type:
The standard spark plug is a Champion
RC12YC (Kohler Part No. 12 132 02-S).
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:
CH11-15
1.02 mm (0.040 in.)
CH16
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
Service the spark plug every 200 hours of operation.
1. Before removing the 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. Replace
the plug if worn or reuse is questionable.
NOTE: Do not clean the 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.
Electrical System and Components
Section 8
3. Check the gap using a wire feeler gauge. Adjust
the gap by carefully bending the ground
electrode. See Figure 8-1. Gap CH11-15 plugs to
1.02 mm (0.040 in.). Gap CH16 plugs to 0.76 mm
(0.030 in.).
NOTE: LP equipped engines should have a
Wire Gauge
Spark Plug
®
®
Ground
Electrode
Figure 8-1. Servicing Spark Plug.
4. Reinstall the spark plug into the cylinder head.
Torque the spark plug to 38.0-43.4 N·m
(28-32 ft. lb.).
spark plug gap of 0.4572 (0.018 in.).
Section 8
8
Gap
8.1
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