7.1
Section 7
Electrical System and Components
7
Section 7
Electrical System and Components
SV470-600
This section covers the operation, service, and repair of the electrical system and electrical system components.
Major electrical systems and components covered in this section include the ignition system, battery, battery
charging systems, electric starter, and optional Oil Sentry
™
oil level pressure switch.
WARNING: Electrical Shock
Never touch electrical wires or components while the engine is running. They can be sources of electrical shock.
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.
The engine is equipped with the following spark plug:
Type: Champion
®
RC12YC or QC12YC
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 2 years or 200 hours of operation, remove the
spark plug. Check its condition, and reset the gap or
replace with a new plug as necessary. Spark plug
replacement is recommended at 500 hours.
1. Before removing the spark plug, clean the area
around the base of the plug to keep dirt and
debris out of the engine. Due to the deep recess
around the spark plug, blowing out the cavity with
compressed air is usually the most effective
method for cleaning. The spark plug is most
accessible when the blower housing is removed
for cleaning.
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.
3. Check the gap using a wire feeler gauge. Adjust
the gap by carefully bending the ground electrode.
Gap plugs to 0.76 mm (0.030 in.). See Figure 7-1.
Figure 7-1. Servicing Spark Plug.
4. Reinstall the spark plug into the cylinder head.
Torque the spark plug to 24-30 N·m (18-22 ft. lb.).
5. Reconnect the spark plug lead and reinstall the
blower housing, if removed previously. Torque the
blower housing screws to 7.5 N·m (65 in. lb.).
Wire Gauge
Ground
Electrode
Spark Plug
0.76 mm
(0.030 in. )
Gap
Not For Resale
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