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Yamaha YZ85V Manuel D'atelier Du Proprietaire page 194

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ELECTRICAL/SPARK PLUG INSPECTION
5PA30850
5PA30860
EC370000
ELECTRICAL
EC371001
SPARK PLUG INSPECTION
1. Remove:
Spark plug
G
2. Inspect:
Electrode 1
G
Wear/damage → Replace.
Insulator color 2
G
Normal condition is a medium to light tan
color.
Distinctly different color → Check the
engine condition.
NOTE:
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
G
Use a wire gauge or thickness gauge.
Out of specification → Regap.
Spark plug gap:
0.5 ~ 0.6 mm (0.020 ~ 0.024 in)
4. Clean the plug with a spark plug cleaner if
necessary.
5. Tighten:
Spark plug
G
NOTE:
Before installing a spark plug, clean the gas-
G
ket surface and plug surface.
Finger-tighten a the spark plug before torqu-
G
ing to specification b.
3 - 36
INSP
ADJ
20 Nm (2.0 m · kg, 1.4 ft · lb)

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