2004 YAMAHA YZF-R1SC Service Manual

3-20
ADJUSTING THE EXHAUST GAS VOLUME
CHK
ADJ
NOTE:
NOTE: 3. Using the “SELECT” button, select either the
Co adjustment mode
1 (which appears as
“Co”) or the diagnosis mode (which appears
as “dIAG”).
4. After “Co” appears as a result of pressing the
“SELECT” button, simultaneously press the
“SELECT” and “RESET” buttons for 2 se-
conds or more to excute the selection.
5. Press the “SELECT” and “RESET” buttons to
select the cylinder
2.

The adjustment cylinder appears on the clock
LCD.
“RESET” button = decrement
“SELECT” button = increment
6. Excute the selection of the cylinder by simul-
taneously pressing the “SELECT” and “RE-
SET” buttons for approximately 2 seconds.
7. After selecting the adjustment cylinder,
change the “Co” adjustment volume by
pressing the “SELECT” and “RESET” but-
tons.
The Co adjustment volume appears on the trip
LCD.
“RESET” button = decrement
“SELECT” button = increment
8. The selection is executed upon releasing the
finger from the switch.
9. Simultaneously press the “SELECT” and
“RESET” buttons to return to the cylinder
selection. (step 5)
10. Cancel the mode by turning “OFF” the main
switch.
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3-21
ADJUSTING THE ENGINE IDLING SPEED
CHK
ADJ
NOTE:
a
b
EAS00052
ADJUSTING THE ENGINE IDLING SPEED
Prior to adjusting the engine idling speed, the
throttle bodies synchronization should be ad-
justed properly, and the engine should have ad-
equate compression.
1. Start the engine and let it warm up for several
minutes.
2. Install:

digital tachometer
(near the spark plug)
3. Check:

engine idling speed
Out of specification
Adjust.
Engine idling speed
1,150  1,250 r / min
4. Adjust:

engine idling speed
a. Turn the idle adjusting screw
1 in direction
a or b until the specified engine idling
speed is obtained.
Direction
Engine idling speed is
increased.
DirectionEngine idling speed is
decreased.
5. Adjust:

throttle cable free play
Refer to “ADJUSTING THE THROTTLE
CABLE FREE PLAY”.
Throttle cable free play (at the
flange of the throttle grip)
3  5 mm (0.12  0.20 in)
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3-22
ADJUSTING THE THROTTLE CABLE FREE PLAY
CHK
ADJ
NOTE:
a
b
WARNING
EAS00056
ADJUSTING THE THROTTLE CABLE FREE
PLAY
Prior to adjusting the throttle cable free play, the
engine idling speed should be adjusted proper-
ly.
1. Check:

throttle cable free play
a
Out of specification
Adjust.
Throttle cable free play (at the
flange of the throttle grip)
3  5 mm (0.12  0.20 in)
2. Adjust:

throttle cable free play
Handlebar side
a. Loosen the locknut
1.
b. Turn the adjusting nut
2 in direction a or b
until the specified throttle cable free play is
obtained.
Direction
Throttle cable free play is
increased.
DirectionThrottle cable free play is
decreased.
c. Tighten the locknut.
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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3-23
CHECKING THE SPARK PLUGS
CHK
ADJ
CAUTION:
EAS00059
CHECKING THE SPARK PLUGS
The following procedure applies to all of the
spark plugs.
1. Remove:

side cowlings

bottom cowlings
Refer to “COWLINGS”.
2. Remove:

radiator upper bolts

radiator lower bolt
Refer to “RADIATOR” in chapter 6.
3. Remove:

ignition coils

spark plugs
Before removing the spark plugs, blow away
any dirt accumulated in the spark plug wells
with compressed air to prevent it from fal-
ling into the cylinders.
4. Check:

spark plug type
Incorrect
Change.
Spark plug type (manufacturer)
CR9EK (NGK)
5. Check:

electrode
1
Damage / wear
Replace the spark plug.

insulator
2
Abnormal color
Replace the spark plug.
Normal color is medium-to-light tan.
6. Clean:

spark plug
(with a spark plug cleaner or wire brush)
7. 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)
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3-24
CHECKING THE SPARK PLUGS /
MEASURING THE COMPRESSION PRESSURECHK
ADJ
13 Nm (1.3 m
kg, 9.4 ft
lb)
NOTE:
NOTE:
CAUTION:
8. Install:

spark plugs

ignition coils
Before installing the spark plug, clean the spark
plug and gasket surface.
9. Install:

radiator upper bolts

radiator lower bolt
Refer to “RADIATOR” in chapter 6.
10. Install:

side cowlings

bottom cowlings
Refer to “COWLINGS”.
EAS00065
MEASURING THE COMPRESSION
PRESSURE
The following procedure applies to all of the cyl-
inders.
Insufficient compression pressure will result in a
loss of performance.
1. Measure:

valve clearance
Out of specification
Adjust.
Refer to “ADJUSTING THE VALVE CLEAR-
ANCE”.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Remove:

ignition coils

spark plugs
Before removing the spark plugs, use com-
pressed air to blow away any dirt accumu-
lated in the spark plug wells to prevent it
from falling into the cylinders.
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3-25
MEASURING THE COMPRESSION PRESSURE
CHK
ADJ
WARNING
NOTE: 4. Install:

compression gauge
1

adapter
Compression gauge
90890-03081, YU-33223
Adapter
90890-04136
5. Measure:

compression pressure
Out of specification
Refer to steps (c) and
(d).
Compression pressure
(at sea level)
Minimum
1,290 kPa (12.90 kg / cm
2,
12.90 bar, 183.48 psi)
Standard
1,480 kPa (14.80 kg / cm
2,
14.80 bar, 210.5 psi)
Maximum
1,660 kPa (16.60 kg / cm
2,
16.60 bar, 236.11 psi)
a. Turn the main switch to “ON”.
b. With the throttle wide open, crank the engine
until the reading on the compression gauge
stabilizes.
To prevent sparking, ground all spark plug
leads before cranking the engine.
The difference in compression pressure be-
tween cylinders should not exceed 100 kPa (1
kg/cm
2, 1 bar, 14.22 psi).
c. If the compression pressure is above the
maximum specification, check the cylinder
head, valve surfaces and piston crown for
carbon deposits.
Carbon deposits
Eliminate.
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3-26
MEASURING THE COMPRESSION PRESSURE /
CHECKING THE ENGINE OIL LEVELCHK
ADJ
13 Nm (1.3 m
kg, 9.4 ft
lb)
NOTE: d. If the compression pressure is below the
minimum specification, pour a teaspoonful of
engine oil into the spark plug bore and mea-
sure again.
Refer to the following table.
Compression pressure
(with oil applied into the cylinder)
ReadingDiagnosis
Higher than
without oilPiston ring(s) wear
or damage

Repair.
Same as without
oilPiston, valves,
cylinder head
gasket or piston
possibly defective

Repair.
6. Install:

spark plug
7. Install:

ignition coils
EAS00069
CHECKING THE ENGINE OIL LEVEL
1. Stand the motorcycle on a level surface.

Place the motorcycle on a suitable stand.

Make sure the motorcycle is upright.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Check:

engine oil level
The engine oil level should be between the
minimum level mark
a and maximum level
mark
b.
Below the minimum level mark
Add the
recommended engine oil to the proper level.
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3-27
CHECKING THE ENGINE OIL LEVEL
CHK
ADJ
NOTE:
NOTE:Recommended oil
AT 5C (40F) or higher
A
Yamalube 4 (20W40) or
SAE 20W40 type SE motor
oil
AT 1 5C (60F) or lower
B
Yamalube 4 (10W30) or
SAE 10W30 type SE motor
oil
Before checking the engine oil level, wait a few
minutes until the oil has settled.
4. Start the engine, warm it up for several min-
utes, and then turn it off.
5. Check the engine oil level again.
Before checking the engine oil level, wait a few
minutes until the oil has settled.
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