Checking The Spark Plug - Yamaha AL125FC 2012 Owner's Manual

PERIODIC MAINTENANCE AND ADJUSTMENT
2
ZAUU0941
1. Panel B
1. Screw (× 4)
To install the panel
Place the panel in the original position,
and then install the screws.
7
ZAUU0616

Checking the spark plug

1 The spark plug is an important engine
component, which is easy to check.
2
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 mainte-
nance and lubrication chart. In addition,
the condition of the spark plug can re-
veal the condition of the engine.
To remove the spark plug
1. Place the vehicle on the center-
stand.
2. Remove panel B. (See page 7-8.)
3. Remove the spark plug cap.
2
ZAUU0932
1. Spark plug cap
2. Spark plug
4. Remove the spark plug as shown,
EAUT1835
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.
_
2. Check the spark plug for elec-
1
7-9
with the spark plug wrench includ-
ed in the owner's tool kit.
around the center electrode of the
spark plug is a medium-to-light
tan (the ideal color when the vehi-
cle is ridden normally).
trode erosion and excessive car-
bon or other deposits,
replace it if necessary.
Specified spark plug:
NGK/CR7E
and