Checking The Spark Plug - Yamaha YFZ450S 2003 Service Manual

CHECKING THE SPARK PLUG

EBS00057
CHECKING THE SPARK PLUG
1. Remove:
• seat
• fuel tank cover
• side covers (left and right)
• fuel tank
NOTE:
Slide the fuel tank.
2. Remove:
• ignition coil
3. Remove:
• spark plug
4. Check:
• spark plug type
Standard spark plug
5. Check:
• electrode 1
• insulator 2
6. Clean:
• spark plug
7. Measure:
• spark plug gap a
8. Tighten:
• spark plug
NOTE:
_
Before installing a spark plug, clean the gasket
surface and plug surface.
3 - 17
Incorrect → Change.
CR8E/NGK
Wear/damage → Replace.
Abnormal color → Replace.
Normal color is a medium-to-light tan color.
(with a spark plug cleaner or wire brush)
Use a wire gauge or thickness gauge.
Out of specification → Regap.
Spark plug gap
0.7 ~ 0.8 mm (0.028 ~ 0.031 in)
13 Nm (1.3 m · kg, 9.4 ft · lb)
CHK
ADJ