Checking The Spark Plugs - Yamaha XJ6S Owner's Manual

PERIODIC MAINTENANCE AND ADJUSTMENT
2
3
1. Cowling B
2. Bolt
3. Quick fastener
3. Disconnect the turn signal light
lead connectors.
6
1
1. Turn signal light lead connector
To install the cowling
1. Connect the turn signal light lead
connectors.
2. Place the cowling in the original
1
position, and then install the bolts
and the quick fastener.
3. Install panel B or C.

Checking the spark plugs

The spark plugs are important engine
components, which should be checked
periodically, preferably by a Yamaha
dealer. Since heat and deposits will
cause any spark plug to slowly erode,
they should be removed and checked
in accordance with the periodic mainte-
nance and lubrication chart. In addition,
the condition of the spark plugs can re-
veal the condition of the engine.
The porcelain insulator around the cen-
ter electrode of each spark plug should
be a medium-to-light tan (the ideal color
when the vehicle is ridden normally),
and all spark plugs installed in the en-
gine should have the same color. If any
spark plug shows a distinctly different
color, the engine could be operating im-
properly. Do not attempt to diagnose
such problems yourself. Instead, have
a Yamaha dealer check the vehicle.
If a spark plug shows signs of electrode
erosion and excessive carbon or other
deposits, it should be replaced.
6-9
Specified spark plug:
NGK/CR9E
EAU19642