1. Spark plug wrench
2. Remove
the
spark
shown, with the spark plug
wrench included in the owner's
tool kit.
PERIODIC MAINTENANCE AND MINOR REPAIR
To check the spark plugs
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1. Check that the porcelain insulator
around the center electrode on
each spark plug is a medium-to-
light tan (the ideal color when the
motorcycle is ridden normally).
2. Check
installed in the engine have the
same color.
NOTE:
plug
as
If any spark plug shows a distinctly
different color, the engine could be
defective. Do not attempt to diagnose
such
problems
have a Yamaha dealer check the
motorcycle.
3. Check each spark plug for elec-
trode erosion and excessive car-
bon
or
replace it if necessary.
Specified spark plug:
CR7HSA (NGK) or
U22FSR-U (DENSO)
that
all
spark
plugs
yourself.
Instead,
other
deposits,
and
6-8
a
a. Spark plug gap
To install a spark plug
1. Measure the spark plug gap with
a wire thickness gauge and, if
necessary, adjust the gap to
specification.
Spark plug gap:
0.6–0.7 mm
2. Clean the surface of the spark
plug gasket and its mating sur-
face, and then wipe off any grime
from the spark plug threads.
3. Install the spark plug with the
spark plug wrench, and then
tighten it to the specified torque.
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