Checking The Spark Plugs - Yamaha XJ6SAP Owner's Manual

PERIODIC MAINTENANCE AND ADJUSTMENT
1
1. Panel B
2. Bolt
2. Push the panel outwards to un-
hook the projection underneath
the panel, and then pull the panel
6 off as shown.
1
1. Projection
To install a panel
Place the panel in the original position,
and then install the bolts.
2

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.
6-10
Specified spark plug:
NGK/CR9E
EAU19642