Yamaha F400A 2022 - Checking the Spark Plug; Installing the Ignition Coil and Spark Plug

Ignition coil and spark plug
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Checking the spark plug
1. Check:
•Electrode “1”
Damaged/worn → Replace.
• Insulator “2”
Abnormal color → Replace.
(Normal color: Medium-to-light tan)
2. Clean:
• Spark plug
(with a spark plug cleaner)
Do not use a wire brush to clean the spark
plugs, as it will damage the iridium coating
on the electrode.
3. Measure:
• Spark plug gap “a”
(with a wire thickness gauge)
Out of specification → Replace.
Installing the ignition coil and spark
plug
1. Install:
• Spark plugs
• Ignition coil brackets
• Ignition coils
Spark plug (NGK)
ILMAR7H-9
Spark plug gap
0.8–0.9 mm (0.031–0.035 in)
T
R
.
.
Spark plug
11 N·m (1.1 kgf·m, 8.1 lb·ft)
Ignition coil bolt
10 N·m (1.0 kgf·m, 7.4 lb·ft)
a
1
2