Yamaha YFM250XL(C) Service Manual page 70

3
SPARK PLUG INSPECTION
3.Inspect:
Spark plug type
Incorrect → Replace.
Standard spark plug:
DR7EA (NGK)
4.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.
5.Clean:
Spark plug
Clean the spark plug with a spark plug
cleaner or wire brush.
6.Measure:
Spark plug gap a
Out of specification → Regap.
Use a wire gauge.
Spark plug gap:
0.6 ~ 0.7 mm (0.024 ~ 0.028 in)
7.Tighten:
Spark plug
NOTE:
Before installing a spark plug, clean the
gasket surface and plug surface.
Finger-tighten the spark plug before
torquing to specification.
Spark plug:
17.5 Nm (1.75 m • kg, 12.5 ft • lb)
3 - 16
INSP
ADJ