Yamaha SX150C Service Manual page 51

INSP
ADJ
GENERAL
3270
3280
3. Measure:
• Spark plug gap a
Out of specification → Regap.
Spark plug gap
0.9 - 1.0 mm (0.035 - 0.039 in)
4. Tighten:
• Spark plug
Spark plug
25 Nm (2.5 m • kgf, 18 ft • lb)
NOTE:
• Before installing the spark plug, clean the
gasket surface and spark plug surface.
Also, it is suggested to apply a thin film of
anti-seize compound to the spark plug
threads to prevent thread seizure.
• If a torque wrench is not available, a good
estimate of the correct tightening torque
is to finger tighten a the spark plug and
then tighten it another 1/4 to 1/2 of a
turn b.
3-18
E