Perio
d
ic maintenance an
d
a
d
justment
7-10
7
2. Remove the spark plug cap.
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.
1. Spark plug cover
2. Bolt
1. Spark plug cap
2
1
1
1. Spark plug wrench
1
Specifie
d
spark plu
g
:
NGK/CPR7EA-9
1. Spark plug gap
Spark plu
g
g
ap:
0.8–0.9 mm (0.031–0.035 in)
UBP612E0.book Page 10 Tuesday, July 3, 2018 4:41 PM
