Yamaha Yzf R1 2007 Manual

VALVES AND VALVE SPRINGS
5-21
EAS24270
VALVES AND VALVE SPRINGS
Removing the valves and valve springs
Order Job/Parts to remove Q’ty Remarks
Cylinder head Refer to CYLINDER HEAD on page 5-18.
1 Intake valve lifter 8
2 Intake valve pad 8
3 Intake valve cotter 16
4 Intake valve upper spring seat 8
5 Intake valve spring 8
6 Intake valve oil seal 8
7 Intake valve lower spring seat 8
8 Intake valve 8
9 Intake valve guide 8
10 Exhaust valve lifter 8
11 Exhaust valve pad 8
12 Exhaust valve cotter 16
13 Exhaust...

VALVES AND VALVE SPRINGS
5-22
For installation, reverse the removal proce-
dure.
Removing the valves and valve springs
Order Job/Parts to remove Q’ty Remarks 

VALVES AND VALVE SPRINGS
5-23
EAS24280
REMOVING THE VALVES
The following procedure applies to all of the 
valves and related components.
NOTE:
Before removing the internal parts of the cylin-
der head (e.g., valves, valve springs, valve 
seats), make sure the valves properly seal.
1. Remove:
 Valve lifter “1”
 Valve pad “2”
NOTE:
Make a note of the position of each valve lifter 
and valve pad so that they can be reinstalled in 
their original place.
2. Check:
 Valve sealing
Leakage at the valve seat →...

VALVES AND VALVE SPRINGS
5-24
 Valve-stem-to-valve-guide clearance
Out of specification → Replace the valve 
guide.
2. Replace:
 Valve guide
NOTE:
To ease valve guide removal and installation, 
and to maintain the correct fit, heat the cylinder 
head to 100°C (212°F) in an oven.
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a. Remove the valve guide with the valve 
guide remover “1”.b. Install the new valve guide with the valve 
guide installer “2” and valve guide remover 
“1”.
c. After installing the valve guide,...

VALVES AND VALVE SPRINGS
5-25
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3. Eliminate:
 Carbon deposits
(from the valve face and valve seat)
4. Check:
Valve face
Pitting/wear → Grind the valve face.
 Valve stem end
Mushroom shape or diameter larger than 
the body of the valve stem → Replace the 
valve.
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...

VALVES AND VALVE SPRINGS
5-26
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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 contacted 
one another, the blueing will have been 
removed.
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4. Lap:
Valve face
 Valve seat
NOTE:
After replacing the cylinder head...

VALVES AND VALVE SPRINGS
5-27
e. Apply a fine lapping compound to the valve 
face and repeat the above steps.
f. After every lapping procedure, be sure to 
clean off all of the lapping compound from 
the valve face and valve seat.
g. Apply Mechanic’s blueing dye (Dykem) “b” 
onto the valve face.
h. Install the valve into the cylinder head.
i. Press the valve through the valve guide 
and onto the valve seat to make a clear 
impression.
j. Measure the valve seat width “c” again. If 
the valve seat width is...

VALVES AND VALVE SPRINGS
5-28
EAS24320
CHECKING THE VALVE LIFTERS
The following procedure applies to all of the 
valve lifters.
1. Check:
 Valve lifter
Damage/scratches → Replace the valve 
lifters and cylinder head.
EAS24340
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” Valve stem seal “2”
(with the recommended lubricant)
3. Install:
Valve “1”
 Lower spring seat “2”
...

VALVES AND VALVE SPRINGS
5-29
5. To secure the valve cotters “1” onto the 
valve stem, lightly tap the valve tip with a 
soft-face hammer.
CAUTION:
ECA13800
Hitting the valve tip with excessive force 
could damage the valve.
6. Lubricate:
 Valve pad “1”
 Valve lifter “2”
(with the recommended lubricant)
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 rein-
stalled in its original position.
Valve...

GENERATOR
5-30
EAS24480
GENERATOR
Removing the generator
Order Job/Parts to remove Q’ty Remarks
Rider seat Refer to GENERAL CHASSIS on page 4-1.
Passenger seat Refer to GENERAL CHASSIS on page 4-1.
Side cowlings Refer to GENERAL CHASSIS on page 4-1.
Lower cowlings Refer to GENERAL CHASSIS on page 4-1.
Engine oilDrain.
Refer to CHANGING THE ENGINE OIL on 
page 3-11.
1 Stator coil assembly coupler 1 Disconnect.
2Plug 1
3 Generator rotor cover 1
4Gasket 1
5Dowel pin 2
6 Generator rotor assembly 1
7 Stator...