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
Spark plug cap
Spark plug wrench
To check the spark plug
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.
Specified spark plug: NGK/CR8E |
To install the spark plug
Spark plug gap
Spark plug gap: 0.7-0.8 mm (0.028-0.031 in) |
Tightening torque: Spark plug: 12.5 Nm (1.25 m.kgf, 9.0 ft.lbf) |
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.
Checking the transmission
1. Measure:
Main axle runout
(with a centering device and dial gauge "1")
Out of specification Replace
the main axle.
2. Measure:
Drive axle runout
(with a centering device and dial gauge "1")
Out of specification Replace
the drive axle.
3. Check:
Transmiss ...
Checking the turn signal relay
1. Check:
Turn signal relay input voltage
Out of specification →The wiring circuit
from
the main switch to the turn signal relay coupler
is faulty and must be repaired.
a. Connect the pocket tester (DC 20 V) to the
turn signal relay terminal as shown.
- Positive tester probe
b ...
Disassembling the front wheel
1. Remove:
Oil seal
Wheel bearings
a. Clean the surface of the front wheel hub.
b. Remove the oil seal "1" with a flat-head
screwdriver.
NOTE:
To prevent damaging the wheel, place a rag "2"
between the screwdriver and the wheel surface.
c. Remove the wheel bearings "3" with a ge ...