Checking The Spark Plug - Yamaha TENERE XT660Z Owner's Manual

PERIODIC MAINTENANCE AND MINOR REPAIR

Checking the spark plug

The spark plug is an important engine
1
component, which is easy to check.
Since heat and deposits will cause
any spark plug to slowly erode, the
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spark plug should be removed and
checked in accordance with the peri-
3
odic maintenance and lubrication
chart. In addition, the condition of the
spark plug can reveal the condition of
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the engine.
5
To remove the spark plug
6
7
8
9
10 1. Spark plug cap
2. Spark plug wrench
1. Remove the spark plug cap.
EAU19603 2. Remove the spark plug as shown,
with the spark plug wrench includ-
ed in the owner's tool kit.
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).
NOTE:
If the spark plug shows a distinctly dif-
ferent color, the engine could be oper-
ating improperly. Do not attempt to di-
agnose such
Instead, have a Yamaha dealer check
the vehicle.
2. Check the spark plug for elec-
trode erosion and excessive car-
bon or other deposits, and re-
place it if necessary.
Specified spark plug:
CR7E (NGK)
To install the spark plug
1. Measure the spark plug gap with
problems yourself.
1. Spark plug gap
2. Clean the surface of the spark
3. Install the spark plug with the
6-8
a wire thickness gauge and, if
necessary, adjust the gap to
specification.
Spark plug gap:
0.7-0.8 mm (0.028-0.032 in)
plug gasket and its mating sur-
face, and then wipe off any grime
from the spark plug threads.
spark plug wrench, and then tight-
en it to the specified torque.