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 systems and electrical system
components.
Spark Plug
Engine misfire or starting problems are often caused
by a spark plug that is in poor condition or has an
improper gap setting.
This engine uses the following spark plugs:
Type: The original spark plug is an NGK
BPR4ES
1
. The Champion
®
equivalent
of that NGK spark plug is RN14YC
2
.
The service replacement is
Champion
®
RC14YC
3
(Kohler Part No.
66 132 01-S). Equivalent alternate
brand spark 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:
1,2
20.6 mm (13/16 in.)
3
15.9 mm (5/8 in.)
Spark Plug Service
Every 100 hours of operation, remove the spark plug,
check its condition and reset the gap, or replace it with
a new plug as necessary.
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
which uses abrasive grit. Some grit could
remain on/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.
4. Reinstall the spark plug into the cylinder head.
Torque the spark plug to 20 N·m (177 in. lb.).
Figure 8-1. Servicing Spark Plug.
Ground
Electrode
0.76 mm
(0.030 in.) Gap
Wire Gauge
Spark Plug
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