6
6-6
1
NGK/CR6HSA
0.6–0.7 mm
12.5 Nm
PERIODIC MAINTENANCE AND MINOR REPAIR
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.
Remove the spark plug cap.
Remove the spark plug as shown
with the spark plug wrench included in
the owner tool kit.
1.
2.
1. Spark plug wrench
Checking the spark plug
Check that the porcelain insulator
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
defective. Do not attempt to diagnose
such problems yourself. Instead, have a
Yamaha dealer check the vehicle.
Check the spark plug for electrode
erosion and excessive carbon or other
deposits, and replace it if necessary.
Specified spark plug:
To install the spark plug
Measure the spark plug gap with a wire
thickness gauge and, if necessary,
adjust the gap to specification.
1.
1.Spark plug gap
Spark plug gap:
Install the spark plug with the spark
plug wrench, and then tighten it to the
specified torque.
Clean the surface of the spark and
its mating surface, and then wipe off
any grime from the spark plug threads.
2.
3.
Tightening torque:
Spark plug:
TIP
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 tight. However, the spark
plug should be tightened to the specified
torque as soon as possible.
4. Install the spark plug cap.
1.
2.