Yamaha MIO AL115S Owner's Manual page 45

2. Remove panel A. (See page 7-7.)
ZAUU0135
1. Spark plug wrench
3. Remove the spark plug cap.
4. Remove the spark plug as shown,
with the spark plug wrench includ-
ed in the owner's tool kit.
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 vehi-
cle is ridden normally).
PERIODIC MAINTENANCE AND ADJUSTMENT
TIP
_
If the spark plug shows a distinctly dif-
ferent color, the engine could be oper-
ating improperly. Do not attempt to
diagnose such problems yourself. In-
stead, have a Yamaha dealer check
the vehicle.
_
2. Check the spark plug for elec-
trode erosion and excessive car-
bon or other deposits,
replace it if necessary.
Specified spark plug:
C7HSA (NGK)
To install the spark plug
1. Measure the spark plug gap with
a wire thickness gauge and, if
necessary, adjust the gap to
specification.
7-8
1. Spark plug gap
and
Spark plug gap:
0.6–0.7 mm (0.031–0.035 in)
2. Clean the surface of the spark
plug gasket and its mating sur-
face, and then wipe off any grime
from the 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:
15 Nm (1.5 m·kgf, 11 ft·lbf)
7