Electrical - Yamaha YZ250(P)/LC Owner's Service Manual

ELECTRICAL/SPARK PLUG INSPECTION
EC370000

ELECTRICAL

EC371001
SPARK PLUG INSPECTION
1. Remove:
9
Spark plug
2. Inspect:
9
Electrode 1
Wear/Damage ¡ Replace.
9
Insulator color 2
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:
9
Plug gap a
Use a wire gauge or thickness gauge.
Out of specification ¡ Regap.
Spark plug gap:
0.5~0.6 mm (0.020~0.024 in)
Standard spark plug:
BR8EG (NGK)
4. Clean the plug with a spark plug cleaner if
necessary.
5. Tighten:
9
Spark plug
NOTE:
9
Before installing a spark plug, clean the
gasket surface and plug surface.
9
Finger-tighten a the spark plug before
torquing to specification b.
3-38
INSP
ADJ
20 Nm (2.0 m•kg, 14 ft•lb)