6
PERIODIC MAINTENANCE AND MINOR REPAIR
ed in the owner’s tool kit. other deposits, and replace it if
necessary.
Specified spark plug:
NGK/CPR7EA-9
spark plug threads.
3. Install the spark plug with the
spark plug wrench, and then tight-
en it to the specified torque.
1.
Spark
plug
wrench
To check the spark plug
1.
Check that the porcelain insulator
around the center electrode of the
spark plug is a medium-to-light tan
(the ideal color when the vehicle is
ridden normally).
NOTE:
_
To install the spark plug
1.
Measure the spark plug gap with a
wire thickness gauge and, if nec-
essary, adjust the gap to specifica-
tion.
Tightening torque:
Spark
plug:
12.5 Nm (1.25 m·kgf, 9 ft·lbf)
1
NOTE:
If a torque wrench is not available when
installing a spark
plug,
a good estimate
of the correct torque is
1/4-1/2
turn
past finger tight. However, the spark
plug should be tightened to the speci-
fied torque as soon as possible.
4.
Install the spark plug cap.
NOTE:.
Make sure the spark plug wire is fas-
tened in the clamp as shown.
If the spark plug shows a distinctly
dif-
ferent color, the engine could be defec-
tive.
Do not attempt to diagnose such
problems yourself. Instead, have a
Yamaha dealer check the vehicle.
1.
Spark plug gap
Spark plug gap:
0.8-0.9
mm (0.031-0.035 in)
2.
Check the spark plug for electrode
erosion and excessive carbon or
2.
Clean the surface of the spark plug
gasket and its mating surface, and
then wipe off any grime from the
6-14
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