Checking The Spark Plug - Yamaha YFM250RX 2008 Service Manual

CHECKING THE SPARK PLUG

EBS00057
CHECKING THE SPARK PLUG
1. Disconnect:
• spark plug cap
2. Remove:
• spark plug
3. Check:
• spark plug type
Incorrect → Change.
Standard spark plug
NGK/DR7EA
4. Check:
• electrode
Wear/damage → Replace.
• insulator
Abnormal color → Replace.
Normal color is a medium-to-light tan color.
5. Clean:
• spark plug
(with a spark plug cleaner or wire brush)
6. Measure:
• spark plug gap
Use a wire gauge or thickness gauge.
Out of specification → Regap.
7. Install:
• spark plug
NOTE: NOTE:
Before installing a spark plug, clean the gasket
surface and plug surface.
8. Install:
• spark plug cap
3-15
CHK
ADJ
Spark plug gap
0.6 ~ 0.7 mm (0.024 ~ 0.028 in)
Spark plug
18 Nm (1.8 m•kg, 13 ft•lb)