Checking The Spark Plug - Yamaha Aerox R NS50F Owner's Manual

PERIODIC MAINTENANCE AND ADJUSTMENT

Checking the spark plug

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 plug
1. Remove panel A. (See page 6-6.)
2. Remove the battery. NOTICE:
When removing the battery, be
6
sure the key is turned to "
then disconnect the negative
lead before disconnecting the
positive lead.
[ECA17711]
3. Remove the partition between the
battery and the spark plug by re-
moving the screws.
EAUM3251
1
ZAUM1080
1. Battery
2. Screw
3. Partition
4. Spark plug cap
4. Remove the spark plug cap.
",
1. Spark plug cap
5. Remove the spark plug as shown,
with a spark plug wrench available
at a Yamaha dealer.
2
3
4
1. Spark plug wrench
To check the spark plug
1. Check that the porcelain insulator
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.
6-7
around the center electrode of the
spark plug is a medium-to-light
tan (the ideal color when the vehi-
cle is ridden normally).