PERIODIC MAINTENANCE AND ADJUSTMENT
6-7
6
EAUM3251
Checkin
g
the spark plu
g
The spark plug is an important engine
component, which is easy to check.
Since heat and deposits will cause any
spark plug to slowly erode, the spark
plug should be removed and checked
in accordance with the periodic main-
tenance and lubrication chart. In addi-
tion, the condition of the spark plug
can reveal the condition of the engine.
To remove the spark plu
g
1. Remove panel A. (See page 6-6.)
2. Remove the battery.
NOTICE:
When removin
g
the
b
attery,
b
e
sure the key is turne
d
to “
”,
then
d
isconnect the ne
g
ative
lea
d
b
efore
d
isconnectin
g
the
positive lea
d
.
[ECA17711]
3. Remove the partition between the
battery and the spark plug by re-
moving the screws.
4. Remove the spark plug cap.
5. Remove the spark plug as shown,
with a spark plug wrench available
at a Yamaha dealer.
To check the spark plu
g
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).
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.
1. Battery
2. Screw
3. Partition
4. Spark plug cap
1. Spark plug cap
ZAUM1080
3
1
4
2
1. Spark plug wrench
U1GBE0E0.book Page 7 Wednesday, June 26, 2013 4:04 PM