Checking The Spark Plug - Yamaha YFM50S Service Manual

CHECKING THE SPARK PLUG

EBS00057
CHECKING THE SPARK PLUG
1. Remove:
• spark plug
2. Check:
• spark plug type
Incorrect → Change.
Standard spark plug
CR7HS/NGK
3. Check:
• electrode 1
Wear/damage → Replace.
• insulator 2
Abnormal color → Replace.
Normal color is a medium-to-light tan color.
4. Clean:
• spark plug
(with a spark plug cleaner or wire brush)
5. Measure:
• spark plug gap a
Use a wire gauge or thickness gauge.
Out of specification → Regap.
6. Tighten:
• spark plug
NOTE:
_
Before installing a spark plug, clean the gasket
surface and plug surface.
3 - 13
CHK
ADJ
Spark plug gap
0.6 ~ 0.7 mm (0.024 ~ 0.028 in)
13 Nm (1.3 m · kg, 9.4 ft · lb)