Perio
d
ic maintenance an
d
a
d
justment
7-10
7
3. Remove the spark plug as shown,
with the spark plug wrench includ-
ed in the additional tool kit, which
was handed out separately at the
purchase of the vehicle.
To check the spark plu
g
s
1. Check that the porcelain insulator
around the center electrode on
each spark plug is a medium-to-
light tan (the ideal color when the
vehicle is ridden normally).
2. Check that all spark plugs in-
stalled in the engine have the
same color.
TIP
If any 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.
3. Check each spark plug for elec-
trode erosion and excessive car-
bon or other deposits, and replace
it if necessary.
4. Measure the spark plug gap with a
wire thickness gauge and, if nec-
essary, adjust the gap to specifi-
cation.
To install a spark plu
g
1. Clean the surface of the spark
plug gasket and its mating sur-
face, and then wipe off any grime
from the spark plug threads.
2. Install the spark plug with the
spark plug wrench, and then tight-
en it to the specified torque.
1. Spark plug cap
1. Spark plug wrench
1
Specifie
d
spark plu
g
:
NGK/LMAR7A-9
1. Spark plug gap
Spark plu
g
g
ap:
0.8–0.9 mm (0.031–0.035 in)
Ti
g
htenin
g
torque:
Spark plug:
13 Nm (1.3 m·kgf, 9.4 ft·lbf)
U27D15E0.book Page 10 Wednesday, May 13, 2015 10:45 AM
