Yamaha F9.9C, Ower'S Manual, Page: 80 / 117

E
4-13
When fitting the plug, always clean the gas-
ket surface and use a new gasket. Wipe off
any dirt from the threads and screw in the
spark plug to the correct torque.
NOTE:
If a torque-wrench is not available when you
are fitting a spark plug, a good estimate of
the correct torque is 1/4 to 1/2 a turn past
finger-tight. Have the spark plug adjusted to
the correct torque as soon as possible with
a torque-wrench.
1
Spark plug gap
2
Spark plug I.D. mark (NGK)
Spark plug torque:
Refer to “SPECIFICATIONS”, page
4-1.
Initial of spark plug Plug wrench size
I.D. mark
B 21 mm (13/16 in.)
C/BK 16 mm (5/8 in.)
D 18.3 mm (23/32 in.)
903033
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