Yamaha VINO YJ50RAP, Service Manual

Page: 58 / 228

3 - 11
CHK
ADJ
CHECKING THE SPARK PLUG/
MEASURING THE COMPRESSION PRESSURE
4. Check:
• electrodes
1
Damage/wear
→
Replace the spark plug.
• insulator
2
Abnormal color
→
Replace the spark plug.
Normal color is medium-to-light tan.
5. Clean:
• spark plug
(with a spark plug cleaner or wire brush)
6. Measure:
• spark plug gap
a
(with a wire gauge)
Out of specification
→
Regap.
7. Install:
• spark plug
NOTE:
@
Before installing the spark plug, clean the
spark plug and gasket surface.
8. Connect:
• spark plug cap
Spark plug gap
0.6 ~ 0.7 mm (0.02 ~ 0.03 in)
T
R
.
.
20 Nm (2.0 m · kg, 14 ft · lb)
EAS00067
MEASURING THE COMPRESSION
PRESSURE
NOTE:
@
Insufficient compression pressure will result in
a loss of performance.
1. Start the engine, warm it up for several min-
utes, and then turn it off.
2. Remove:
• center cover
• footrest board
Refer to “SIDE COVERS AND FOOTREST
BOARD”.
3. Disconnect:
• spark plug cap
4. Remove:
• spark plug
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