2005 YAMAHA VX110 clock

5-51
EPOWRCAMSHAFTS
Install the exhaust and intake camshaft
caps.
NOTE:
Gradually tighten the intake and exhaust
camshaft cap bolts in 2–3 steps in the
sequence shown.
T R..
Camshaft cap bolt:
10 N  m (1.0 kgf  m, 7.2 ft  lb)
NOTE:
Make sure that the punch marks c
on the
camshafts are aligned with the arrow marks
d
on the camshaft caps.
Out of alignment →
Reinstall.
Remove the wire from the timing chain.
10 1 4 5 8
17 5 1 4 8 15 9 12 149 3 2
7 6
18 7 3 2 6
13 11 10 16
3. Install:
Timing chain tensioner
Installation steps:
While lightly pressing the timing chain
tensioner rod by hand, turn the tensioner
rod fully clockwise with a thin screwdriver
1
.
NOTE:
Make sure that the tensioner rod has been
fully set clockwise.
With the timing chain tensioner rod
turned all the way into the timing chain
tensioner housing (with the thin screw-
driver still installed), install the gasket and
the timing chain tensioner 2
onto the cyl-
inder block.
WARNING
Always use a new gasket.
Tighten the timing chain tensioner bolts
3
to the specified torque.
NOTE:
The “UP” mark on the timing chain ten-
sioner should face up.
33
2
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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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5-65
EPOWRVALVES AND VALVE SPRINGS
2. Install the new valve guide 2
by striking
the special service tool from the camshaft
side until the valve guide clip 3
contacts
the cylinder head.
NOTE:
Apply engine oil to the surface of the new
valve guide.
Valve guide remover:
Intake (ø4.0 mm):
YM-04111/90890-04111
Exhaust (ø4.5 mm):
YM-04116/90890-04116
Valve guide installer:
Intake (ø4.0 mm):
YM-04112/90890-04112
Exhaust (ø4.5 mm):
YM-04117/90890-04117
3
E
2
3. Insert the special service tool into the
valve guide 2
, and then ream the valve
guide.
NOTE:
Turn the valve guide reamer clockwise to
ream the valve guide.
Do not turn the reamer counterclockwise
when removing the reamer.
4. Measure:
Valve guide inside diameter
Valve guide reamer:
Intake (ø4.0 mm):
YM-04113/90890-04113
Exhaust (ø4.5 mm):
YM-04118/90890-04118
Valve guide inside diameter:
Intake:
4.000–4.012 mm
(0.1575–0.1580 in)
Exhaust:
4.500–4.512 mm
(0.1772–0.1776 in)
2
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5-67
EPOWRVALVES AND VALVE SPRINGS
Valve seat reface
1. Reface the valve seat with the valve seat
cutter.
2. Cut the surface of the valve seat with a 45°
cutter by turning the cutter clockwise until
the valve seat face has become smooth.
aSlag or rough surface
CAUTION:
Do not over cut the valve seat. Be sure to
turn the cutter evenly downward at a pres-
sure of 40–50 N (4–5 kgf, 8.8–11 lbf) to pre-
vent chatter marks.
Valve seat cutter holder:
Intake (ø4.0 mm):
90890-06811
Exhaust (ø4.5 mm):
90890-06812
Valve seat cutter:
30° (intake):
90890-06815
45° (intake):
90890-06814
60° (intake):
90890-06813
30° (exhaust):
90890-06328
45° (exhaust):
90890-06312
60° (exhaust):
90890-06315
Neway valve seat cutter kit:
YM-91044
3. Use a 30° cutter to adjust the contact width
of the top edge of the valve seat.
bPrevious contact width
30˚
b
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