2011 Yamaha Motorsports Zuma 125 Owners Manual - Page 47

2011 Yamaha Motorsports Zuma 125 Manual

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EAU1722A PERIODIC MAINTENANCE AND ADJUSTMENT EAUT1835 Checking the spark plug The spark plug is an important engine component, which is easy to check. Since heat and deposits will cause any spark plug to slowly erode, the spark plug should be removed and checked in accordance with the periodic maintenance and lubrication chart. In addition, the condition of the spark plug can reveal the condition of the engine. To remove the spark plug 1. Place the vehicle on the centerstand. 2. Remove panel B. (See page 6-9.) 3. Remove the spark plug cap. 4. R e m o v e t h e s p a r k p l u g a s shown, with the spark plug wrench included in the owner's tool kit. carbon or other deposits, and replace it if necessary. Specified spark plug: U22ESR-N (DENSO) 1 2 3 4 Spark plug gap: 0.7 ~ 0.8 mm (0.028 ~ 0.031 in) 5 1 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. To check the spark plug 1. Check that the porcelain insulator around the center electrode of the spark plug is a medium-tolight tan (the ideal color when the vehicle is ridden normally). TIP If the spark plug shows a distinctly different color, the engine could be operating improperly. Do not attempt to diagnose such problems yourself. Instead, have a Yamaha dealer check the vehicle. 2. Check the spark plug for electrode erosion and excessive 6-10 2. Clean the surface of the spark plug gasket and its mating surface, 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. Tightening torque: Spark plug: 13 Nm (1.3 m·kgf, 9.4ft·lbf) 6 7 8 9 TIP If a torque wrench is not available

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6-10
EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT
EAUT1835
Checking the spark plug
The spark plug is an important engine
component, which is easy to check.
Since heat and deposits will cause
any spark plug to slowly erode, the
spark plug should be removed and
checked in accordance with the pe-
riodic maintenance and lubrication
chart. In addition, the condition of the
spark plug can reveal the condition of
the engine.
To remove the spark plug
1. Place the vehicle on the center-
stand.
2. Remove panel B. (See page 6-9.)
3. Remove the spark plug cap.
4. Remove the spark plug as
shown, with the spark plug
wrench included in the owner’s
tool kit.
1
1. Spark plug wrench
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
vehicle is ridden normally).
TIP
If the spark plug shows a distinctly
different color, the engine could be
operating improperly. Do not attempt
to diagnose such problems yourself.
Instead, have a Yamaha dealer check
the vehicle.
2. Check the spark plug for elec-
trode erosion and excessive
carbon or other deposits, and re-
place it if necessary.
Specified spark plug:
U22ESR-N (DENSO)
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:
0.7 ~ 0.8 mm (0.028 ~ 0.031 in)
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.
Tightening torque:
Spark plug:
13 Nm (1.3 m·kgf, 9.4ft·lbf)
TIP
If a torque wrench is not available