Removing And Installing Cowlings; Checking The Spark Plugs - Yamaha XTZ690 Owner's Manual

Removing and installing cowl-
ings
The cowlings shown need to be re-
moved to perform some of the mainte-
nance jobs described in this chapter.
Refer to this section each time a cowl-
ing needs to be removed and installed.
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1. Cowling A
Cowling A
To remove the cowling
Remove the screws, and then take the
cowling off.
Periodic maintenance and adjustment
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1. Cowling A
2. Bolt and washer
To install the cowling
Place the cowling in the original posi-
tion, and then install the screws.
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Checking the spark plugs

The spark plugs are important engine
components,
checked periodically, preferably by a
Yamaha dealer. Since heat and depos-
its will cause any spark plug to slowly
erode, they should be removed and
checked in accordance with the peri-
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odic maintenance and lubrication
chart. In addition, the condition of the
spark plugs can reveal the condition of
the engine.
The porcelain insulator around the
center 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 engine should have the same
color. If any spark plug shows a dis-
tinctly different color, the engine could
be operating improperly. Do not at-
tempt to diagnose such problems
yourself. Instead, have a Yamaha deal-
er check the vehicle.
If a spark plug shows signs of elec-
trode erosion and excessive carbon or
other deposits, it should be replaced.
6-9
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which should be
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