Checking The Spark Plugs; Measuring The Compression Pressure - Yamaha FZ1-N 2007 Service Manual

Manuals by Motomatrix / www.motomatrix.co.uk / The Solution For Lost Motorcycle Coded Keys
c. Tighten the locknut.
EWA5D01003
WARNING
After adjusting the throttle cable free play,
start the engine and turn the handlebars to
the right and to the left to ensure that this
does not cause the engine idling speed to
change.
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EAS20680

CHECKING THE SPARK PLUGS

The following procedure applies to all of the
spark plugs.
1. Remove:
• Radiator upper bolts
• Radiator lower bolt
Refer to "RADIATOR" on page 6-1.
2. Remove:
• Ignition coils
• Spark plugs
ECA13320
CAUTION:
Before removing the spark plugs, blow
away any dirt accumulated in the spark
plug wells with compressed air to prevent it
from falling into the cylinders.
3. Check:
• Spark plug type
Incorrect → Change.
Spark plug type (manufacturer)
CR9EK (NGK)
4. Check:
• Electrode "1"
Damage/wear → Replace the spark plug.
• Insulator "2"
Abnormal color → Replace the spark plug.
Normal color is medium-to-light tan.
5. Clean:
• Spark plug
(with a spark plug cleaner or wire brush)
email: info@motomatrix.co.uk
6. Measure:
• Spark plug gap "a"
(with a wire thickness gauge)
Out of specification → Regap.
Spark plug gap
0.6–0.7 mm (0.0236–0.0276 in)
7. Install:
• Spark plugs
• Ignition coils
Spark plug
13 Nm (1.3 m·kg, 9.4 ft·lb)
NOTE:
Before installing the spark plug, clean the
spark plug and gasket surface.
8. Install:
• Radiator upper bolts
• Radiator lower bolt
Refer to "RADIATOR" on page 6-1.
EAS20710
MEASURING THE COMPRESSION PRES-
SURE
The following procedure applies to all of the
cylinders.
NOTE:
Insufficient compression pressure will result in
a loss of performance.
1. Measure:
• Valve clearance
Out of specification → Adjust.
Refer to "ADJUSTING THE VALVE
CLEARANCE" on page 3-4.
2. Start the engine, warm it up for several
minutes, and then turn it off.
3. Remove:
• Ignition coils
• Spark plugs
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ENGINE