General; Checking The Anode; Checking The Spark Plugs - Yamaha 25BMH Service Manual

CHK

GENERAL

ADJ
GENERAL

CHECKING THE ANODE

Check:
• Anodes
Scales → Clean.
Oil/grease → Clean.
Excessive wear → Replace.
CAUTION:
Do not oil, grease, or paint the anode, or it
will not operate properly.

CHECKING THE SPARK PLUGS

1. Check:
• Electrodes
Cracks/excessive wear → Replace.
• Insulator color
Distinctly different color → Check the
engine condition.
Color guide:
Medium to light tan color
Normal
Whitish color
• Lean fuel mixture
• Plugged jet (s)
• Wrong setting
Blackish color
• Rich mixture
• Excessive oil usage
• Defective ignition system
• Defective spark plug
2. Clean:
• Spark plug
(use a spark plug cleaner or wire
brush)
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