Yamaha MORPHOUS CP250V Owner's Manual page 56

PERIODIC MAINTENANCE AND MINOR REPAIR
ed in the owner's tool kit.
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1
2
3
1. Spark plug wrench
4
To check the spark plug
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1. Check that the porcelain insulator
around the center electrode of the
6
spark plug is a medium-to-light tan
(the ideal color when the vehicle is
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ridden normally).
NOTE:
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If the spark plug shows a distinctly dif-
ferent color, the engine could be defec-
tive. Do not attempt to diagnose such
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problems yourself. Instead, have a
Yamaha dealer check the vehicle.
2. Check the spark plug for electrode
erosion and excessive carbon or
other deposits, and replace it if
necessary.
Specified spark plug:
NGK/CPR7EA-9
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.
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1. Spark plug gap
Spark plug gap:
0.8–0.9 mm (0.031–0.035 in)
2. Clean the surface of the spark plug
gasket and its mating surface, and
then wipe off any grime from the
6-14
spark plug threads.
3. Install the spark plug with the
spark plug wrench, and then tight-
en it to the specified torque.
Tightening torque:
Spark plug:
12.5 Nm (1.25 m·kgf, 9 ft·lbf)
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.