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Yamaha F6BMH - Checking the Spark Plugs

Yamaha F6BMH
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GENERAL
DO NOT SMOKE when charging or
handling batteries.
KEEP BATTERIES AND ELECTROLYTIC
FLUID OUT OF REACH OF CHILDREN.
NOTE:
Batteries vary among manufacturers.
Therefore, the following procedures may
not always apply. Consult your battery
manufacturer’s instructions.
First, disconnect the negative lead, then
the positive lead.
Check:
Electrolyte level
Below the minimum level
a
Add
distilled water to the proper level.
Electrolyte specific gravity
Less than specification
Recharge
the battery.
CHECKING THE SPARK PLUGS
1. Spark plug type:
BR6HS-10
2. Check:
Electrodes 1
Cracks/excessive wear
Replace.
Insulator color 2
Distinctly different color
Check the
engine condition.
3. Clean:
Spark plug
(with a spark plug cleaner or wire
brush).
Electrolyte specific gravity:
1.280 at 20°C (68°F)
Color guige:
Medium to light tancolor
Normal
Whitish color
Blackish color
Lean fuel mixture
Plugged jet(-s)
Wrong setting
Rich mixture
Excessive oil usage
Defective ignition system
Defective spark plug
3-23

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