Yamaha Mt 01 T 2005 Manual

CYLINDER HEADS
5-32
EAS24140REMOVING THE CYLINDER HEADS
1. Remove:
Cylinder head nuts
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.
EAS24170CHECKING THE CYLINDER HEADS
The following procedure applies to all of the cyl-
inder heads.
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...

CYLINDER HEADS
5-33
EAS24250INSTALLING THE CYLINDER HEADS
1. Tighten:
Cylinder head nuts (M12) “1”–“4”
Cylinder head nuts (M10) “5”, “6”
NOTE:
Lubricate the cylinder head nuts with engine 
oil.
Tighten the cylinder head nuts in the proper 
tightening sequence as shown and torque 
them in two stages.
T R.. 
Cylinder head nut (M12)
45 Nm (4.5 m·kg, 32 ft·lb)
T R.. 
Cylinder head nut (M10)
39 Nm (3.9 m·kg, 28 ft·lb)
A. Front cylinder
B. Rear cylinder
6
4
2 13
5
B 

VALVES AND VALVE SPRINGS
5-34
EAS24270
VALVES AND VALVE SPRINGS
Removing the valves and valve springs
Order Job/Parts to remove Q’ty Remarks
The following procedure applies to both 
cylinders.
Cylinder heads Refer to “CYLINDER HEADS” on page 5-31.
1 Valve cotter 8
2 Upper spring seat 4
3 Outer valve spring 4
4 Inner valve spring 4
5 Intake valve 2
6 Exhaust valve 2
7 Valve stem seal 4
8 Lower spring seat 4
9 Valve guide 4
For installation, reverse the removal 
procedure.
5683472 1
834721
8 3 4 7 2
1
8 3...

VALVES AND VALVE SPRINGS
5-35
EAS24280REMOVING THE VALVES
The following procedure applies to all of the 
valves and related components.
NOTE:
Before removing the internal parts of the cylinder 
head (e.g., valves, valve springs, valve seats), 
make sure the valves properly seal.
1. Check:
Valve sealing
Leakage at the valve seat → Check the valve 
face, valve seat, and valve seat width.
Refer to “CHECKING THE VALVE SEATS” 
on page 5-37.



 





 
 








 
 



 
 



 



a. Pour a clean solvent “a”...

VALVES AND VALVE SPRINGS
5-36
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.



 





 
 








 
 



 
 



 



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, bore the valve 
guide with the valve guide reamer “3” to ob-
tain the proper...

VALVES AND VALVE SPRINGS
5-37
6. Measure:
Valve stem runout
Out of specification → Replace the valve.
NOTE:
When installing a new valve, always replace 
the valve guide.
If the valve is removed or replaced, always re-
place the oil seal.
EAS24300CHECKING THE VALVE SEATS
The following procedure applies to all of the 
valves and valve seats.
1. Eliminate:
Carbon deposits
(from the valve face and valve seat)
2. Check:
Valve seat
Pitting/wear → Replace the cylinder head.
3. Measure:
Valve seat width C...

VALVES AND VALVE SPRINGS
5-38



 





 
 








 
 



 
 



 



a. Apply a coarse lapping compound “a” to the 
valve face.
CAUTION:
ECA13790
Do not let the lapping compound enter the 
gap between the valve stem and the valve 
guide.
b. Apply molybdenum disulfide oil onto the 
valve stem.
c. Install the valve into the cylinder head.
d. Turn the valve until the valve face and valve 
seat are evenly polished, then clean off all of 
the lapping compound.
NOTE:
For the best lapping results, lightly tap...

VALVES AND VALVE SPRINGS
5-39
3. Measure:
Valve spring tilt “a”
Out of specification → Replace the valve 
spring.
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 guide “1”
Lower spring seat “2”
Valve stem seal “3”
Valve “4”
Inner valve spring “5”
Outer valve spring “6”
 
Inner spring...

VALVES AND VALVE SPRINGS
5-40
Upper spring seat “7”
(into the cylinder head)
NOTE:
Install the valve springs with the larger pitch “a” 
facing up.
4. Install:
Valve cotters
NOTE:
Install the valve cotters by compressing the 
valve springs with the valve spring compressor 
set “1”.5. To secure the valve cotters 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.
b. Smaller pitch
 
Valve spring...

CYLINDERS AND PISTONS
5-41
EAS24360
CYLINDERS AND PISTONS
Removing the cylinders and pistons
Order Job/Parts to remove Q’ty Remarks
Cylinder head Refer to “CYLINDER HEADS” on page 5-31.
1 Front cylinder 1
2 Rear cylinder 1
3 Cylinder gasket 2
4 Dowel pin 4
5 Piston pin clip 4
6 Piston pin 2
7Piston 2
8Top ring 2
9 2nd ring 2
10 Oil ring 2
For installation, reverse the removal 
procedure.
1
3
457 8
9
103
4
6557
6
5 8
9
10 2
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