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INSP
ADJ
ELECTRICAL/SPARK PLUG INSPECTION
EC370000
ELECTRICAL
EC371001
SPARK PLUG INSPECTION
1. Remove:
● Spark plug
2. Inspect:
● Electrode 1
Wear/damage → Replace.
● Insulator color 2
Normal condition is a medium to light
tan color.
Distinctly different color → Check the
engine condition.
N
OTE:
When the engine runs for many hours at low
speeds, the spark plug insulator will become
sooty, even if the engine and carburetor are in
good operating condition.
3. Measure:
● Plug gap a
Use a wire gauge or thickness gauge.
Out of specification → Regap.
4. Clean the plug with a spark plug cleaner
if necessary.
Spark plug gap:
0.6 ~ 0.7 mm (0.02 ~ 0.03 in)
Standard spark plug:
CR6HSA (NGK)
U20FSR-U (DENSO)
5. Tighten:
● Spark plug
N
OTE:
● Before installing a spark plug, clean the gas-
ket surface and plug surface.
● Finger-tighten a the spark plug before
torquing to specification b.
T
R
.
.
13 Nm (1.3 m · kg, 9.4 ft · lb)