1999 YAMAHA YZF-R7 oil

4 - 26
ENGVALVES AND VALVE SPRINGS
5. Measure:
• valve margin thickness a
Out of specification ® Replace the
valve.
6. Measure:
• valve stem runout
Out of specification ® Replace the
valve.
NOTE:
• When installing a new valve, always
replace the valve guide.
• If the valve is removed or replaced,
always replace the oil seal.
Valve margin thickness
Intake
0.9 ~ 1.2 mm
(0.028 ~ 0.047 in)
Exhaust
1.0 ~ 1.3 mm
(0.039 ~ 0.051 in)
Valve stem runout
0.01 mm (0.0004 in)
EB403410
CHECKING THE VALVE SEATS
The following procedure applies to all of
the valves and valve seats.
1. Eliminate:
• carbon deposits
(from the valve face and valve seat)
2. Check:
• valve seat
Pitting/wear ® Replace the cylinder
head.
3. Measure:
• valve seat width a
Out of specification ® Replace the cyl-
inder head.
Valve seat width
0.9 ~ 1.1 mm
(0.035 ~ 0.043 in)
: 1.6 mm (0.06 in)

4 - 27
ENGVALVES AND VALVE SPRINGS
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. Apply Mechanic’s blueing dye
(Dykem) b onto the valve face.
b. Install the valve into the cylinder
head.
c. Press the valve through the valve
guide and onto the valve seat to make
a clear impression.
d. Measure the valve seat width.
NOTE:
Where the valve seat and valve face con-
tacted one another, the blueing will have
been removed.
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. Lap:
• valve face
• valve seat
NOTE:
After replacing the cylinder head or
replacing the valve and valve guide, the
valve seat and valve face should be
lapped.
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. Apply a coarse lapping compound a
to the valve face.
ACHTUNG:CAUTION:
Do not let the lapping compound enter
the gap between the valve stem and the
valve guide.
b. Apply molybdenum disulfide oil onto
the valve stem.
c. Install the valve into the cylinder
head.
d. Turn the valve until the valve face and
valve seat are evenly polished, then
clean off all of the lapping compound.
NOTE:
For the best lapping results, lightly tap
the valve seat while rotating the valve
back and forth between your hands.

4 - 30
ENGVALVES AND VALVE SPRINGS
EB403702
INSTALLING THE VALVES
The following procedure applies to all of
the valves and related components.
1. Deburr:
• valve stem end
(with an oil stone)
2. Lubricate:
• valve stem 1
• oil seal 2
(with the recommended lubricant)
Recommended lubricant
Molybdenum disulfide oil
3. Install:
• oil seal 1
• valve 2
• lower spring seat 3
• valve springs 4
• upper spring seat 5
(into the cylinder head)
NOTE:
• Make sure that each valve is installed
in its original place.
• Install the valve spring with the larger
pitch a facing up.
b Smaller pitch
New
aa
b
ba

4 - 31
ENG

VALVES AND VALVE SPRINGS
4. Install:
• valve cotters
1
NOTE:

Install the valve cotters by compressing
the valve spring with the valve spring
compressor
2
and attachment
3
.
5. To secure the valve cotters
1
onto the
valve stem, lightly tap the valve tip with
a soft-face hammer.
ACHTUNG:CAUTION:

Hitting the valve tip with excessive
force could damage the valve.
Valve spring compressor
90890-04019
Attachment
(for the intake valve spring)
9080-04114
(for the exhaust valve spring)
90890-04108
6. Lubricate:
• valve pad
(with the recommended lubricant)
Recommended lubricant
Molybdenum disulfide oil
7. Install:
• valve pad
• valve lifter
NOTE:

• The valve lifter must move smoothly
when rotated with a finger.
• Each valve lifter and valve pad must be
reinstalled in its original position.

ENG

4 - 32
GENERATOR
EB410000
GENERATOR
Order Job/Part Q’ty Remarks
Removing the stator coil assembly
Remove the parts in the order listed.
Bottom cowling and front cowling Refer to “COWLINGS” in chapter 3.
Engine oil Drain.
Refer to “CHANGING THE ENGINE
OIL” in chapter 3.
1 Throttle stop screw holder 1
2 Generator rotor cover 1
3 Generator rotor cover gasket 1
4 Dowel pin 2
5 Generator rotor bolt 1
6 Generator rotor 1
7 Stator coil assembly coupler 1 Disconnect.
8 Stator coil assembly lead holder 1
9 Stator coil assembly 1
For installation, reverse the removal
procedure.

4 - 33
ENG

GENERATOR
EB410110
REMOVING THE GENERATOR
1. Remove:
• generator rotor cover
1

NOTE:

Loosen each bolt 1/4 of a turn at a time,
in stages and in a crisscross pattern.
After all of the bolts are fully loosened,
remove them.
1
1

2. Remove:
• generator rotor bolt
1

• washer
NOTE:

While holding the generator rotor
2
with the rotor holding tool
3
, loosen the
generator rotor bolt.
Rotor holding tool
90890-01235
3. Remove:
• generator rotor
1
(with the flywheel puller
2
and rotor
holding tool
3
)
Flywheel puller
90890-01080
EB410700
INSTALLING THE GENERATOR
1. Apply:
• sealant
(onto the stator coil assembly lead
grommet)
2. Install:
• generator rotor
• washer
• generator rotor bolt
WARNINGWARNING

Always use a new generator rotor bolt.
ACHTUNG:CAUTION:

• Clean the tapered portion of the crank-
shaft and the generator rotor hub with
lacquer thinner.
• Lubricate the generator rotor bolt
threads with engine oil.
Yamaha bond No. 1215
90890-85505

ENG

4 - 35
PICKUP COIL
PICKUP COIL
T R..45 Nm (4.5 m • kg, 32 ft • Ib)
T R..12 Nm (1.2 m • kg, 8.7 ft • Ib)
T R..4 Nm (0.4 m • kg, 2.9 ft • Ib)
T R..15 Nm (1.5 m • kg, 11 ft • Ib)
E
LTLT
LTLT
1
(6)23
4
5 64 7
New

Order Job/Part Q’ty Remarks
Removing the pickup coil and
pickup coil rotor
Remove the parts in the order listed.
Fuel tank Refer to “FUEL TANK AND AIR FIL-
TER” in chapter 3.
Bottom cowling and front cowling Refer to “COWLINGS” in chapter 3.
Engine oil Drain.
Refer to “CHANGING THE ENGINE
OIL” in chapter 3.
Generator rotor cover Refer to “GENERATOR”.
1 Pickup coil lead holder 1
2 Pickup coil rotor cover 1
3 Pickup coil rotor cover gasket 1
4 Dowel pin 2

ENG

4 - 36
PICKUP COIL
T R..45 Nm (4.5 m • kg, 32 ft • Ib)
T R..12 Nm (1.2 m • kg, 8.7 ft • Ib)
T R..4 Nm (0.4 m • kg, 2.9 ft • Ib)
T R..15 Nm (1.5 m • kg, 11 ft • Ib)
E
LTLT
LTLT
1
(6)23
4
5 64 7
New

Order Job/Part Q’ty Remarks
5 Pickup coil coupler 1 Disconnect.
6 Pickup coil 1
7 Pickup coil rotor 1
For installation, reverse the removal
procedure.