Yamaha Yzf R1 2007 Manual

CAMSHAFTS
5-11
EAS23810
REMOVING THE CAMSHAFTS
1. Remove:
 Pickup rotor cover
Refer to CRANKSHAFT POSITION SEN-
SOR on page 5-37.
2. Align:
 “T” mark “a” on the pickup rotor
(with the crankcase mating surface “b”)
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a. Turn the crankshaft counterclockwise.
b. When piston #1 is at TDC on the compres-
sion stroke, align the “T” mark “a” on the 
pickup rotor with the crankcase mating sur-
face “b”.
NOTE:
TDC on the compression stroke can be found 
when the camshaft lobes are...

CAMSHAFTS
5-12
EAS23850
CHECKING THE CAMSHAFTS
1. Check:
 Camshaft lobes
Blue discoloration/pitting/scratches → 
Replace the camshaft.
2. Measure:
 Camshaft lobe dimensions “a” and “b”
Out of specification → Replace the cam-
shaft.3. Measure:
 Camshaft runout
Out of specification → Replace.
4. Measure:
 Camshaft-journal-to-camshaft-cap clear-
ance
Out of specification → Measure the cam-
shaft journal diameter.
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a. Install the camshaft into the cylinder head 
(without the...

CAMSHAFTS
5-13
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5. Measure:
 Camshaft journal diameter “a”
Out of specification → Replace the cam-
shaft.
Within specification → Replace the cylinder 
head and the camshaft caps as a set.
EAS23870
CHECKING THE TIMING CHAIN AND CAM-
SHAFT SPROCKET
1. Check:
 Timing chain “1”
Damage/stiffness → Replace the timing 
chain and camshaft and camshaft sprocket 
as a set.2. Check:
 Camshaft sprocket
More than 1/4 tooth wear “a” → Replace 
the camshaft sprocket and the timing chain...

CAMSHAFTS
5-14
NOTE:
Squeeze the timing chain tensioner clip, and 
then remove the timing chain tensioner spring 
and timing chain tensioner rod.
2. Check:
 Timing chain tensioner housing
 Timing chain tensioner rod
 Timing chain tensioner spring
Damage/wear → Replace.
3. Install:
 Timing chain tensioner spring
 Timing chain tensioner rod “1”
NOTE:
Prior to installing the timing chain tensioner 
rod, drain the engine oil from the timing chain 
tensioner housing.
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a....

CAMSHAFTS
5-15
EAS24000
INSTALLING THE CAMSHAFTS
1. Align:
 “T” mark “a” on the pickup rotor
(with the crankcase mating surface “b”)
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a. Turn the crankshaft clockwise.
b. When position #1 is at TDC, align the “T” 
mark “a” with the crankcase mating surface 
“b”.
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2. Install:
 Intake camshaft sprocket “1”
 Exhaust camshaft sprocket “2”
(with the camshaft sprockets temporarily 
tightened)
NOTE:
Install the camshaft sprockets as a illustration....

CAMSHAFTS
5-16
CAUTION:
ECA4C81004
 Lubricate the camshaft cap bolts with the 
engine oil.
 The camshaft cap bolts must be tightened 
evenly or damage to the cylinder head, 
camshaft caps, and camshafts will result.
 Do not turn the crankshaft when installing 
the camshaft to avoid damage or 
improper valve timing.
6. Tighten:
 Camshaft sprocket bolts “1”
CAUTION:
ECA4C81005
Be sure to tighten the camshaft sprocket 
bolts to the specified torque to avoid the 
possibility of the bolts coming loose and...

CAMSHAFTS
5-17
11. Measure:
 Valve clearance
Out of specification → Adjust.
Refer to ADJUSTING THE VALVE 
CLEARANCE on page 3-4.
12. Install:
 Pickup coil rotor cover
CRANKSHAFT POSITION SENSOR on 
page 5-37. 

CYLINDER HEAD
5-18
EAS24100
CYLINDER HEAD
Removing the cylinder head
Order Job/Parts to remove Q’ty Remarks
Engine Refer to ENGINE REMOVAL on page 5-1.
Intake camshaft Refer to CAMSHAFTS on page 5-9.
Exhaust camshaft Refer to CAMSHAFTS on page 5-9.
1 Cylinder head 1
2 Cylinder head gasket 1
3Dowel pin 2
4 Coolant pipe 1
5O-ring 1
6 Water pump breather hose 1
For installation, reverse the removal proce-
dure. 

CYLINDER HEAD
5-19
EAS24120
REMOVING THE CYLINDER HEAD
1. Remove:
 Intake camshaft
 Exhaust camshaft
Refer to REMOVING THE CAMSHAFTS 
on page 5-11.
2. Remove:
 Cylinder head nuts
 Cylinder head bolts
NOTE:
 Loosen the nuts in the proper sequence as 
shown.
 Loosen each nut 1/2 of a turn at a time. After 
all of the nuts are fully loosened, remove 
them.
EAS24160
CHECKING THE CYLINDER HEAD
1. Eliminate:
 Combustion chamber carbon deposits
(with a rounded scraper)
NOTE:
Do not use a sharp instrument...

CYLINDER HEAD
5-20
2. Install:
 Gasket “1” 
 Dowel pins
3. Install:
 Cylinder head
NOTE:
Pass the timing chain through the timing chain 
cavity.
4. Tighten:
 Cylinder head nuts “1” – “10”
 Cylinder head nuts “7” “10”
 Cylinder head bolts “11” “12”
NOTE:
 First, tighten the nuts “1” – “10” to approxi-
mately 10 Nm (1.0 m·kg, 7.2 ft·lb) with a 
torque wrench, and then tighten the 25 Nm 
(2.5 m·kg, 18 ft·lb).
 Retighten the nuts “1” – “10” to 40 Nm (4.0 
m·kg, 29 ft·lb) with a torque wrench.
...