engine YAMAHA YZF-R1SC 2004 Workshop Manual

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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3-24
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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3-28
CHANGING THE ENGINE OIL
CHK
ADJ
NOTE:
CAUTION:
EAS00074
CHANGING THE ENGINE OIL
1. Start the engine, warm it up for several min-
utes, and then turn it off.
2. Place a container under the engine oil drain
bolt.
3. Remove:

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

engine oil filler cap
1
Remove the engine oil filler cap 1 with the spe-
cial wrench
2 and cover 3.
5. Remove:

engine oil drain bolt
1
(along with the gasket)
6. Drain:

engine oil
(completely from the crankcase)
7. If the oil filter cartridge is also to be replaced,
perform the following procedure.
a. Remove the oil filter cartridge
1 with an oil
filter wrench
2.
Oil filter wrench
90890-01426, YU-38411
b. Lubricate the O-ring
3 of the new oil filter
cartridge with a thin coat of engine oil.
Make sure the O-ring
3 is positioned cor-
rectly in the groove of the oil filter cartridge.
c. Tighten the new oil filter cartridge to specifi-
cation with an oil filter wrench.
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3-29
CHANGING THE ENGINE OIL /
MEASURING THE ENGINE OIL PRESSURECHK
ADJ
43 Nm (4.3 m
kg, 31 ft
lb)
CAUTION:
Oil filter cartridge
17 Nm (1.7 m
kg, 12 ft
lb)
8. Replace:

engine oil drain bolt gasket
New
9. Install:

engine oil drain bolt
(along with the new gasket)
10. Fill:

crankcase
(with the specified amount of the recom-
mended engine oil)
Quantity
Total amount
3.8 L (3.35 Imp qt, 4.02 US qt)
Without oil filter cartridge
replacement
2.9 L (2.55 Imp qt, 3.07 US qt)
With oil filter cartridge
replacement
3.1 L (2.73 Imp qt, 3.28 US qt)
11. Install:

engine oil filler cap

bottom cowlings
Refer to “COWLINGS”.
12. Start the engine, warm it up for several min-
utes, and then turn it off.
EAS00077
MEASURING THE ENGINE OIL PRESSURE
1. Check:

engine oil level
Below the minimum level mark
a
Add the
recommended engine oil to the proper level.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
When the engine is cold, the engine oil will
have a higher viscosity, causing the engine
oil pressure to increase. Therefore, be sure
to measure the engine oil pressure after
warming up the engine.
3. Remove:

bottom cowlings
Refer to “COWLINGS”.
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3-30
MEASURING THE ENGINE OIL PRESSURE
CHK
ADJ
WARNING
NOTE: 4. Remove:

oil gallery bolt
1
The engine, muffler and engine oil are ex-
tremely hot.
5. Install:

oil pressure gauge
1

adapter 2
Pressure gauge
90890-03153, YU-03153
Oil pressure adapter
90890-03139
6. Measure:

engine oil pressure
(at the following conditions)
Engine oil pressure
230 kPa
(2.3 kg / cm
2, 2.3 bar, 32.71 psi)
Engine speed
Approx. 5,000 r / min
Engine oil temperature
100C (212F)
Regarding the oil pressure as its own data may
fluctuate depending on the oil temperature and
viscosity, the oil pressure may fluctuate when
measuring. The following data should be used
only as a reference when measuring the engine
oil pressure.
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3-31
MEASURING THE ENGINE OIL PRESSURE /
ADJUSTING THE CLUTCH CABLE FREE PLAYCHK
ADJ
8 Nm (0.8 m
kg, 5.8 ft
lb)
CAUTION:
c
b
NOTE:Engine oil pressure
Possible causes
Below
ifi i
Faulty oil pump
specificationClogged oil filter
Leaking oil
passage
Broken or
damaged oil seal
Above
specificationLeaking oil
passage
Faulty oil filter
Oil viscosity too
high
7. Install:

oil gallery bolt
1
Be carful to tighten too much.
8. Install:

bottom cowlings
Refer to “COWLINGS”.
EAS00078
ADJUSTING THE CLUTCH CABLE FREE
PLAY
1. Check:

clutch cable free play
a
Out of specification
Adjust.
Clutch cable free play (at the
end of the clutch lever)
10  15 mm (0.39  0.59 in)
2. Adjust:

clutch cable free play
Handlebar side
a. Turn the adjusting dial
1 in direction b or c
until the specified clutch cable free play is ob-
tained.
Direction
Clutch cable free play is
increased.
DirectionClutch cable free play is
decreased.
If the specified clutch cable free play cannot be
obtained on the handlebar side of the cable, use
the adjusting nut on the engine side.
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