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Checking The Spark Plug - Yamaha YZF-R125 Owner's Manual

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1. Screw
2. Panel A
To install the panel
1. Place the panel in the original po-
sition, and then install the screws.
2. Install the rider seat.

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 cowling A. (See page
2. Remove the spark plug cap.
1. Spark plug cap
3. Remove the spark plug as shown,
with the spark plug wrench includ-
ed in the owner's tool kit.
1. Spark plug wrench
To check the spark plug
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).
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.


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