Inspecting The Spark Plugs - Yamaha SX150C Service Manual

INSP
ADJ
GENERAL
3260
NOTE:
• Batteries vary
Therefore, the following procedures may
not always apply. Consult your battery
manufacturer's instructions.
• First, disconnect the negative lead, then
the positive lead.
Inspect:
• Electrolyte level
Below the minimum level mark →
Add distilled water to the proper level.
• Electrolyte specific gravity
Less than specification → Recharge
the battery.
Electrolyte specific gravity
1.280 at 20˚C (68˚F)

INSPECTING THE SPARK PLUGS

1. Inspect:
• Electrodes 1
Cracks/excessive wear → Replace.
• Insulator color 2
Distinctly different color →
Check the engine condition.
Color guide
Medium to light tan color
Normal
Whitish color
• Lean fuel mixture
• Plugged jet(-s)
• Air leak
• Wrong setting
Blackish color
• Rich mixture
• Excessive oil usage
• Defective ignition system
• Defective spark plug
2. Clean:
• Spark plug
(with a spark plug cleaner or wire
brush.)
3-17
among manufacturers.
E
3