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3-14 DISASSEMBLY, REASSEMBLY, INSPECTION, AND MAINTENANCE
Ignition System
Automatic Ignition Advance Device
This device enables the engine to achieve appropriate ignition timing
in all speed ranges. The ignition timing must be retarded slightly when
the engine is started and at the low- to medium-speed range. On the
other hand, the ignition timing must be advanced in the high-speed
range in order to generate the sparks early on, because the intervals of
the air-fuel mixture ignition and expansion are shorter.
The diagram on the right shows the relationship between the
crankshaft speed and the ignition timing (degrees before the top dead
center) of the automatic ignition timing device of the FE series.
Spark Inspection
Check for sparks as follows:
•
Remove the spark plug, connect it to the plug cap that is attached
to the high-tension lead, and place the spark plug in contact with the
engine block. When doing so, place the spark plug as far away as
possible from the spark plug hole and make contact at an area that
does not contain gasoline.
CAUTION
Perform the spark inspection after making sure that there is no
presence of gasoline in the area in order to prevent unintended
ignition.
•
Turn the stop switch or the key switch ON to turn the crankshaft, and
check if sparks are generated at the electrode of the spark plug.
If there are no sparks or the sparks are weak, clean the spark plug,
adjust the spark plug electrode gap to between 0.7 and 0.8 mm, and
check for sparks again.
If there are no sparks or the sparks are weak even after cleaning the
spark plug and adjusting its electrode gap, replace the spark plug
with a new one and check for sparks again.
If there are no sparks or the sparks are weak even after installing a
new spark plug, inspect the ignition system.
Spark Plug Cleaning and Inspection
•
Using a wire brush, remove the carbon deposits from the spark plug.
If the spark plug is contaminated with oil, wash it in a cleaning solvent.
•
If the electrode is worn or the insulator is cracked, replace the spark
plug.
•
Using a gap gauge, measure the electrode gap of the spark plug.
If the gap is incorrect, adjust it to the correct gap by bending the
horizontal electrode.
Spark Plug Electrode Gap
Standard: 0.7 ~ 0.8 mm (0.030 ~ 0.032 in)
•
Tighten the spark plug to the specified torque.
Ignition Plug Specification Tightening Torque
23 N
m (2.3 kg m, 17 ft lb)
A: Center Electrode
B: Horizontal Electrode
C: Insulator
D: Electrode Gap