2005 YAMAHA VX110 service

5-47
EPOWRCAMSHAFTS
5. Remove:
Camshaft caps
Dowel pins
NOTE:
Loosen the intake and exhaust camshaft cap
bolts in the sequence shown.
1 10 7 6 3
2
14 18 15 11 4 10 7 52 8 9
4 5
1 12 16 17 13
6 8 9 3
6. Remove:
Intake camshaft 1

Exhaust camshaft 2

NOTE:
To prevent the timing chain from falling into the
crankcase, fasten it with a wire 3
.
7. Remove:
Exhaust camshaft sprocket 1

Intake camshaft sprocket 2

(with the special service tool 3
)
Universal magneto and rotor
holder:
YU-01235
Rotor holder:
90890-01235
Camshaft inspection
1. Check:
Camshaft lobes
Bluediscoloration/pitting/scratches →
Replace the camshaft.
2. Measure:
Camshaft lobe dimensions a
and b

Out of specification →
Replace the cam-
shaft.
Cam lobe dimensions:
Intake camshaft:
a 31.15 mm (1.226 in)
b 25.00 mm (0.984 in)
Exhaust camshaft:
a 30.75 mm (1.211 in)
b 25.00 mm (0.984 in)
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5-50
EPOWRCAMSHAFTS
Camshaft installation
1. Install:
Exhaust camshaft sprocket 1

Intake camshaft sprocket 2

(with the special service tool 3
)
NOTE:
Install the camshaft sprocket with the punch
mark a
facing outside.
Universal magneto and rotor
holder:
YU-01235
Rotor holder:
90890-01235
T R..
Camshaft sprocket bolt:
24 N  m (2.4 kgf  m, 17 ft  lb)
2. Install:
Exhaust camshaft
Intake camshaft
Exhaust camshaft caps
Intake camshaft caps
Installation steps:
Turn the drive coupling counterclockwise,
and then check if cylinder #1 is at TDC of
the compression stroke with a dial gauge.
Install the timing chain onto both cam-
shaft sprockets, and then install the cam-
shaft.
CAUTION:
Do not turn the crankshaft when install-
ing the camshaft to avoid damage or
improper valve timing.
NOTE:
Make sure that the punch marks a
on the
camshafts face up.
Be sure to align the alignment marks b
made during removal to install the timing
chain and camshaft sprockets.
b
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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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5-59
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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