1999 YAMAHA YZF-R7 oil pressure

3 - 22
CHK
ADJ
MEASURING THE COMPRESSION PRESSURE
WARNINGWARNING
To prevent sparking, ground all spark
plug leads before cranking the engine.
NOTE:
The difference in compression pressure
between cylinders should not exceed
100 kPa (1 kg/cm2, 14 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.
d. If the compression pressure is below
the minimum specification, squirt a
few drops of oil into the cylinder and
measure again.
Refer to the following table.
s s s s s s s s s s s s s s s s s s s s s s s s s s s
7. Install:
• spark plug Compression pressure
(with oil applied into the cylinder)
Reading Diagnosis
Higher than with-
out oilPiston wear or
damage ® Repair.
Same as without
oilPiston ring(-s),
valve(-s), cylinder
head gasket or
piston possibly
defective ®
Repair.
T R..13 Nm (1.3 m · kg, 9.4 ft · lb)

3 - 25
CHK
ADJ
CHANGING THE ENGINE OIL
9. Fill:
• crankcase
(with the specified amount of the rec-
ommended engine oil)
10.Install:
• engine oil filler cap
11.Start the engine, warm it up for several
minutes, and then turn it off.
12.Check:
• engine
(for engine oil leaks)
13.Check:
• engine oil level
Refer to “CHECKING THE ENGINE OIL
LEVEL”.
Quantity
Total amount
3.6 L (3.2 lmp qt, 3.8 US qt)
Without oil filter cartridge
replacement
2.6 L (2.3 lmp qt, 2.7 US qt)
With oil filter cartridge
replacement
2.8 L (2.5 lmp qt, 3.0 US qt)
14.Check:
• engine oil pressure
t t t t t t t t t t t t t t t t t t t t t t t t t t t
a. Slightly loosen the oil gallery bolt 1.
b. Start the engine and keep it idling
until engine oil starts to seep from the
oil gallery bolt. If no engine oil comes
out after one minute, turn the engine
off so that it will not seize.
c. Check the engine oil passages, the oil
filter cartridge and the oil pump for
damage or leakage. Refer to “OIL
PAN AND OIL PUMP” in chapter 4.
d. Start the engine after solving the
problem(-s) and check the engine oil
pressure again.
e. Tighten the oil gallery bolt to
specification.
s s s s s s s s s s s s s s s s s s s s s s s s s s s
T R..
Oil gallery bolt
20 Nm (2.0 m • kg, 14 ft • lb)
1
1

3 - 43
CHK
ADJLUBRICATING THE DRIVE CHAIN/
CHECKING AND ADJUSTING THE STEERING HEAD
EB304100
LUBRICATING THE DRIVE CHAIN
The drive chain consists of many interact-
ing parts. If the drive chain is not main-
tained properly, it will wear out rapidly.
Therefore, the drive chain should be ser-
viced, especially when the motorcycle is
used in dusty areas. This motorcycle has a
drive chain with small rubber O-rings
between each side plate. Steam cleaning,
high-pressure washing, certain solvents,
and the use of a coarse brush can damage
these O-rings. Therefore, use only kerosine
to clean the drive chain. Wipe the drive
chain dry and thoroughly lubricate it with
engine oil or chain lubricant that is suitable
for O-ring chains. Do not use any other
lubricants on the drive chain since they may
contain solvents that could damage the O-
rings.
Recommended lubricant
Engine oil or chain lubricant
suitable for O-ring chains
EB304130
CHECKING AND ADJUSTING THE
STEERING HEAD
1. Stand the motorcycle on a level surface.
WARNINGWARNING
Securely support the motorcycle so that
there is no danger of it falling over.
NOTE:
Place the motorcycle on a suitable stand
so that the front wheel is elevated.
2. Check:
• steering head
Grasp the bottom of the front fork legs
and gently rock the front fork.
Looseness/binding ® Adjust the steer-
ing head.

3 - 51
CHK
ADJ
CHECKING THE TIRES
EB304170
CHECKING THE TIRES
The following procedure applies to both of
the tires.
1. Measure:
• tire pressure
Out of specification ® Regulate.
WARNINGWARNING
• The tire pressure should only be
checked and regulated when the tire
temperature equals the ambient air
temperature.
• The tire pressure and the suspension
must be adjusted according to the
total weight (including cargo, rider,
passenger and accessories) and the
anticipated riding speed.
• Operation of an overloaded motorcy-
cle could cause tire damage, an acci-
dent or an injury.
NEVER OVERLOAD THE MOTORCYCLE.
* total of cargo, rider and accessories
WARNINGWARNING
It is dangerous to ride with a worn-out
tire. When the tire tread reaches the
wear limit, replace the tire immediately.Basic weight
(with oil
and a full
fuel tank)207 kg (456 lb)
Maximum
load*317 kg (699 lb)
Cold tire
pressureFront Rear
Up to 90 kg
(198 lb)
load*250 kPa
(2.5 kgf/cm
2,
36 psi)250 kPa
(2.5 kgf/cm2,
36 psi)
90 kg (198 lb)
~ maximum
load*250 kPa
(2.5 kgf/cm
2,
36 psi)290 kPa
(2.9 kgf/cm2,
41 psi)
High-speed
riding250 kPa
(2.5 kgf/cm
2,
36 psi)250 kPa
(2.5 kgf/cm2,
36 psi)

5 - 11
COOLOIL COOLER
3. Fill:
• cooling system
(with the specified amount of the rec-
ommended coolant)
Refer to “CHANGING THE COOLANT”
in chapter 3.
• crankcase
(with the specified amount of the rec-
ommended engine oil)
Refer to “CHANGING THE ENGINE
OIL” in chapter 3.
4. Check:
• cooling system
Leaks ® Repair or replace any faulty
part.
5. Measure:
• radiator cap opening pressure
Below the specified pressure ®
Replace the radiator cap.
Refer to “CHECKING THE RADIATOR”.

7 - 85
CHAS
c. Remove the drive chain from the ker-
osine and completely dry it.
ACHTUNG:CAUTION:
This motorcycle has a drive chain with
small rubber O-rings 1 between the
drive chain side plates. Never use high-
pressure water or air, steam, gasoline,
certain solvents (e.g., benzine), or a
coarse brush to clean the drive chain.
High-pressure methods could force dirt
or water into the drive chain’s internals,
and solvents will deteriorate the O-
rings. A coarse brush can also damage
the O-rings. Therefore, use only kero-
sine to clean the drive chain.
s s s s s s s s s s s s s s s s s s s s s s s s s s s
4. Check:
• O-rings 1
Damage ® Replace the drive chain.
• drive chain rollers 2
Damage/wear ® Replace the drive
chain.
• drive chain side plates 3
Cracks/damage/wear ® Replace the
drive chain.
5. Lubricate:
• drive chain
Recommended lubricant
Engine oil or chain lubricant
suitable for O-ring chains
6. Check:
• drive sprocket
• rear wheel sprocket
More than 1/4 tooth a wear ® Replace
the drive chain sprockets as a set.
Bent teeth ® Replace the drive chain
sprockets as a set.
b Correct
1Drive chain roller
2Drive chain sprocket
SWINGARM AND DRIVE CHAIN

8 - 1
–+ELEC

ELECTRICAL COMPONENTS
EB800000
ELECTRICAL
ELECTRICAL COMPONENTS
1
Wire harness
2
Main switch
3
Front brake light switch
4
Ignition coils
5
Clutch switch
6
Throttle position sensor
7
Intake air temperature sensor
8
Intake air pressure sensor
9
Atmospheric pressure sensor
0
Turn signal relay
A
Relay unit
B
ECU
C
CDI unit
D
Fuse box
E
Fall detection switch
F
Starter relay
G
Main fuse
H
Main relay
I
Battery
J
Rectifier/regulator
K
Rear brake light switch
L
Neutral switch
M
Speed sensor
N
Sidestand switch
O
Stator coil assembly
P
Oil level switch
Q
Pickup coil
R
Radiator fan
S
Horn
T
Coolant temperature
sender
U
Thermo switch
V
Camshaft sensor
8

8 - 29
–+ELECELECTRONIC FUEL INJECTION SYSTEM
1Main switch
5Battery
6Main fuse
CCamshaft sensor
DThrottle position sensor
EIntake air pressure sensor
FAtmospheric pressure sensor
GIntake air temperature sensor
HCoolant temperature sensor
IPickup coil
JECU
KCylinder #1-injector 1
LCylinder #2-injector 1
MCylinder #3-injector 1
NCylinder #4-injector 1
OCylinder #1-injector 2
PCylinder #2-injector 2
QCylinder #3-injector 2
RCylinder #4-injector 2
XFall detection switch
YSpeed sensor
yFuel pump
zMain relay
}Engine stop switch
ŒElectronic fuel injection system fuse
£ECU fuse
TROUBLESHOOTING
NOTE:
• Before troubleshooting, remove the following part(-s):
1) bottom cowling
2) front cowling
• Troubleshoot with the following special tool(-s).
The condition code is displayed by the tachometer.
Check the condition code list to
identify the faulty part. Refer to
“ELECTRICAL CONTROL SYS-
TEM”.
In diagnosis mode, select the
appropriate diagnosis code to
check the operation of the faulty
part.Check the
wiring.Replace.
Co, diagnosis switch box
90890-03171
Test coupler adapter
90890-03149
Out of specifi-
cationNo good