YAMAHA VX110 2005 Service Manual

5-52
EPOWRCAMSHAFTS
T R..
Timing chain tensioner bolt:
10 N  m (1.0 kgf  m, 7.2 ft  lb)
Remove the screwdriver, make sure the
timing chain tensioner rod releases, and
then tighten the cap bolt to the specified
torque.
T R..
Cap bolt:
10 N  m (1.0 kgf  m, 7.2 ft  lb)
4. Turn:
Drive coupling
(several turns counterclockwise)
5. Check:
Turn the drive coupling counterclock-
wise, and then check if cylinder #1 is at
TDC of the compression stroke with a
dial gauge.
Camshaft punch marks a

Make sure that the camshaft punch
marks are aligned with the arrow marks
b
on the camshaft caps.
Out of alignment →
Adjust.
Refer to the installation steps above.
6. Measure:
Valve clearance
Out of specification →
Adjust.
Refer to “POWER UNIT” in Chapter 3.
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5-53
EPOWRCAMSHAFTS
7. Install:
Cylinder head cover gasket
Cylinder head cover
NOTE:
Apply sealant onto the mating surfaces of the
cylinder head cover gasket and cylinder
head.
Tighten the cylinder head cover bolts stages
and in a crisscross pattern.
T R..
Cylinder head cover bolt:
12 N  m (1.2 kgf  m, 8.7 ft  lb)
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5-54
EPOWRCYLINDER HEAD
CYLINDER HEAD
EXPLODED DIAGRAM
REMOVAL AND INSTALLATION CHART
Step Procedure/Part name Q’ty Service points
CYLINDER HEAD REMOVAL
Follow the left “Step” for removal.
Engine unit Refer to “ENGINE UNIT”.
Intake assembly Refer to “FUEL INJECTION SYSTEM” in
Chapter 4.
Exhaust pipes 1 and 2 Refer to “EXHAUST PIPES 1 AND 2”.
Oil tank Refer to “OIL TANK”.
Intake and exhaust camshaft Refer to “CAMSHAFTS”.
1Bolt 2
2 Hunger 1
3Bolt 3
EEE
E
2 4
1
855
7
9 3 6
6
LT
271
2nd 121 ± 5˚ 1st 20 N • m (2.0 kgf
• m, 14 ft
• Ib)
2nd 140 ± 5˚ 1st 20 N • m (2.0 kgf
• m, 14 ft
• Ib)
10 N •
m (1.0 kgf • m, 7.2 ft • Ib)
6 × 12 mm
10 N •
m (1.0 kgf • m, 7.2 ft • Ib)
6 × 55 mm
8 × 20 mm
6
2nd 105 ± 5˚ 1st 20 N • m (2.0 kgf
• m, 14 ft
• Ib)
2nd 105 ± 5˚ 1st 20 N • m (2.0 kgf
• m, 14 ft
• Ib)
2nd 105 ± 5˚ 1st 20 N • m (2.0 kgf
• m, 14 ft
• Ib)
2nd 105 ± 5˚ 1st 20 N • m (2.0 kgf
• m, 14 ft
• Ib)
E6
4
66
6
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5-55
EPOWRCYLINDER HEAD
EXPLODED DIAGRAM
Step Procedure/Part name Q’ty Service points
4 Nut/washer 2/2
5 Nut/washer 3/3
6 Nut/washer 5/5
7 Cylinder head 1
8 Cylinder head gasket 1
9 Dowel pin 2
Reverse the removal steps for installation.
EEE
E
2 4
1
855
7
9 3 6
6
LT
271
2nd 121 ± 5˚ 1st 20 N • m (2.0 kgf
• m, 14 ft
• Ib)
2nd 140 ± 5˚ 1st 20 N • m (2.0 kgf
• m, 14 ft
• Ib)
10 N •
m (1.0 kgf • m, 7.2 ft • Ib)
6 × 12 mm
10 N •
m (1.0 kgf • m, 7.2 ft • Ib)
6 × 55 mm
8 × 20 mm
6
2nd 105 ± 5˚ 1st 20 N • m (2.0 kgf
• m, 14 ft
• Ib)
2nd 105 ± 5˚ 1st 20 N • m (2.0 kgf
• m, 14 ft
• Ib)
2nd 105 ± 5˚ 1st 20 N • m (2.0 kgf
• m, 14 ft
• Ib)
2nd 105 ± 5˚ 1st 20 N • m (2.0 kgf
• m, 14 ft
• Ib)
E6
4
66
6
Not reusable
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5-56
EPOWRCYLINDER HEAD
SERVICE POINTS
Cylinder head removal
1. Remove:
Cylinder head bolts 1

2. Remove:
Cylinder head nuts
NOTE:
Loosen the cylinder head nuts in the sequence
shown.
Cylinder head inspection
1. Eliminate:
Combustion chamber carbon deposits
(with a rounded scraper)
NOTE:
Do not use a sharp instrument to avoid damag-
ing or scratching:
spark plug bore threads
valve seats
2. Check:
Cylinder head
Damage/scratches →
Replace.
Cylinder head water jacket
Mineral deposits/rust →
Eliminate.
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5-57
EPOWRCYLINDER HEAD
3. Measure:
Cylinder head warpage
Out of specification →
Replace the cyl-
inder head.
Cylinder head warpage limit:
0.1 mm (0.004 in)
Measurement steps:
Place a straightedge 1
and a thickness
gauge 2
across the cylinder head.
Measure the warpage.
If the limit is exceeded, replace the cylin-
der head.
Cylinder head installation
1. Install:
Cylinder head
NOTE:
Pass the timing chain through the timing
chain cavity.
Lubricate the cylinder head nuts with engine
oil.
Tighten the cylinder head nuts in the
sequence shown.
T R..
Cylinder head nut
1:
1st:
20 N  m (2.0 kgf  m, 14 ft  lb)
2nd:
121
± 5°
Cylinder head nut
2:
1st:
20 N  m (2.0 kgf  m, 14 ft  lb)
2nd:
105
± 5°
Cylinder head nut
3:
1st:
20 N  m (2.0 kgf  m, 14 ft  lb)
2nd:
140
± 5°
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5-58
EPOWRCYLINDER HEAD
2. Tighten:
Cylinder head bolts 1

NOTE:
Lubricate the cylinder head bolts with engine
oil.
T R..
Cylinder head bolt:
10 N  m (1.0 kgf  m, 7.2 ft  lb)
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5-59
EPOWRVALVES AND VALVE SPRINGS
VALVES AND VALVE SPRINGS
EXPLODED DIAGRAM
REMOVAL AND INSTALLATION CHART
Step Procedure/Part name Q’ty Service points
VALVES AND VALVE SPRINGS
REMOVALFollow the left “Step” for removal.
Cylinder head Refer to “CYLINDER HEAD”.
1 Intake valve lifter 12
2 Intake valve pad 12
3 Intake valve cotter 24
4 Intake valve upper spring seat 12
5 Intake valve spring 12
6 Intake valve stem seal 12
7 Intake valve lower spring seat 12
8 Intake valve 12
9 Intake valve guide 12
E
E
E
89
17 18 16 15 14 13 10
11
121
2
3
4
5
6
7 3
12
Not reusable
Not reusable
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5-60
EPOWRVALVES AND VALVE SPRINGS
EXPLODED DIAGRAM
Step Procedure/Part name Q’ty Service points
10 Exhaust valve lifter 8
11 Exhaust valve pad 8
12 Exhaust valve cotter 16
13 Exhaust valve upper spring seat 8
14 Exhaust valve spring 8
15 Exhaust valve stem seal 8
16 Exhaust valve lower spring seat 8
17 Exhaust valve 8
18 Exhaust valve guide 8
Reverse the removal steps for installation.
E
E
E
89
17 18 16 15 14 13 10
11
121
2
3
4
5
6
7 3
12
Not reusable
Not reusable
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5-61
EPOWRVALVES AND VALVE SPRINGS
SERVICE POINTS
Valve removal
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. Remove:
Valve cotters 1

NOTE:
Remove the valve cotters by compressing the
valve spring with the valve spring compressor
2
and attachment 3
.
Valve spring compressor:
YM-01253/90890-04019
Valve spring compressor
attachment:
(for the intake valve):
YM-04114/90890-04114
(for the exhaust valve):
YM-04108/90890-04108
3. Remove:
Upper spring seat 1

Valve spring 2

Valve 3

Stem seal 4

Lower spring seat 5

NOTE:
Identify the position of each part very carefully
so that it can be reinstalled in its original place.
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