4-15
GB
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.
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.
1
Spark plug gap
2
Spark plug I.D. mark (NGK)
Spark plug torque:
Refer to “SPECIFICATIONS”, page 4-1.
Initial of spark
Plug wrench size
plug I.D. mark
B
21 mm (13/16 in.)
C/BK
16 mm (5/8 in.)
D
18.3 mm (23/32”)
903022
q
w
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.
63B-9-78-A0-4b 3/3/03 5:26 PM Page 10
