6-7
PERIODIC MAINTENANCE AND MINOR REPAIR
6
2. Remove the spark plug as
shown, with the spark plug
wrench included in the owner’s
tool kit.
1. Spark plug wrench
To install the spark plug
1. Measure the spark plug gap with
a wire thickness gauge and, if
necessary, adjust the gap to
specification.
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.
a. Spark plug gap
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
machine is ridden normally).
NOTE:
If the spark plug shows a distinctly
different color, the engine could be
defective. Do not attempt to diagnose
such problems yourself. Instead,
have a Yamaha dealer check the
machine.
2. Check the spark plug for elec-
trode erosion and excessive car-
bon or other deposits, and
replace it if necessary.
Specified spark plug:
CR9E (NGK) or
U27ESR-N (DENSO)
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
5GF-9-14 (USA) 4/23/02 2:10 PM Page 46
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