Checking The Spark Plugs - Yamaha FZ6 Owner's Manual

PERIODIC MAINTENANCE AND MINOR REPAIR
1. Projection
2. Slot
Panel C
6 To remove the panel
1. Remove the seat. (See page
3-13.)
2. Remove the bolt, and then pull the
panel off as shown.
1. Panel C
2. Bolt
To install the panel
EAU33020
1. Place the panel in the original posi-
tion, and then install the bolt.
2. Install the seat.
6-10

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.
Specified spark plug:
NGK/CR9EK
EAU19642