PERIODIC MAINTENANCE AND MINOR REPAIR
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2
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1. Spark plug wrench
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3. Remove
the
shown, with the spark plug
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wrench included in the owner's
tool kit.
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To check the spark plug
1. Check that the porcelain insula-
tor around the center electrode
of the spark plug is a medium-to-
light tan (the ideal color when the
scooter is ridden normally).
NOTE:
If the spark plug shows a distinctly
different color, the engine could be
defective. Do not attempt to diagnose
spark
plug
as
such
have a Yamaha dealer check the
scooter.
2. Check the spark plug for elec-
trode erosion and excessive car-
bon
replace it if necessary.
Specified spark plug:
problems
yourself.
Instead,
or
other
deposits,
DR8EA (NGK)
6-13
a
a. Spark plug gap
To install the 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
and
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.