Inspecting The Spark Plug - Yamaha TZR50 '03 Service Manual

ADJUSTING THE FREE PLAY OF THE CHOKE CABLE /

INSPECTING THE SPARK PLUG

3-7
ADJUSTING THE FREE PLAY OF THE
CHOKE CABLE / INSPECTING THE SPARK
PLUG
1. Check
• Free play of the choke cable
Out of specification
Free play:
1.5 ~ 3.5 mm
Adjustment steps:
• Remove the right-hand side fairing
• Remove the tensor casing on the carbu-
rettor
• Turn the tensor inwards or outwards until
getting the free play specified
Turning inwards
Turning outwards
• Install the tensor casing
INSPECTING THE SPARK PLUG
1. Remove:
• The spark plug
2. Inspect:
• The type of spark plug
Incorrect Change
Standard spark plug:
BR9ES
3. Inspect:
• The electrode
Wear/damage
• The insulation
Abnormal colour
The normal colour is a medium-light
beige
4. Clean the spark plug with a special tool for
this or with a metal brush.
5. Measure:
• The gap between electrodes (a)
Use a wire or feeler gauge
This does not match the value specified
Correct the distance.
Spark plug gap:
0.7 ~ 0.8 mm.
INSP
ADJ
Adjust
increases the play
reduces the play
replace
Replace