Yamaha TMax XP500 Owner's Manual page 56

PERIODIC MAINTENANCE AND MINOR REPAIR
To check the spark plugs
1. Check that the porcelain insula-
tor around the center electrode
on each spark plug is a medium-
to-light tan (the ideal color when
the scooter is ridden normally).
2. Check that all
installed in the engine have the
same color.
NOTE:
If any spark plug shows a distinctly
different color, the engine could be
defective. Do not attempt to diagnose
6
such problems yourself.
have a Yamaha dealer check the
scooter.
3. Check each spark plug for elec-
trode erosion and excessive car-
bon or other
replace it if necessary.
Specified spark plug:
CR7E (NGK)
Ofrecido por www.electromanuales.com
spark plugs
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
Instead,
specification.
Spark plug gap:
0.7–0.8 mm
2. Clean the surface of the spark
plug gasket and its mating sur-
deposits, and
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.
a
6-11
Tightening torque:
Spark plug:
12.5 Nm (1.25 m·kgf)
NOTE:
If a torque wrench is not available
when installing a spark plug, a good
estimate of the correct torque is
1/4–1/2 turn past finger
However, the spark plug should be
tightened to the specified torque as
soon as possible.
4. Install the spark plug cap.
tight.