Checking Top Cowling - Yamaha F15C Owner's Manual

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When fitting the plug, always clean the
gasket surface and use a new gasket.
Wipe off any dirt from the threads and
screw in the spark plug to the correct
torque.
Spark plug torque:
Refer to "SPECIFICATIONS", page 4-1.
NOTE:
If a torque-wrench is not available when
you are fitting a spark plug, a good esti-
mate 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.
Initial of spark plug
I.D. mark
B
C/BK
D
1 Spark plug gap
2 Spark plug I.D. mark (NGK)
EMU16350

CHECKING TOP COWLING

Check the fitting of the top cowling by
pushing it with both hands.
If the fitting is loose have it repaired by a
Yamaha dealer.
4-14
E
Plug wrench size
21 mm (13/16 in.)
16 mm (5/8 in.)
18.3 mm (23/32 in.)