Yamaha Mt 01 T 2005 Manual

CAMSHAFTS
5-22
3. Remove:
Camshaft drive gear “1”
Camshaft driven gear “2”
Straight keys
Front cylinder camshaft end cover
NOTE:
Cover the crankcase hole with a clean rag “3” to 
prevent the straight keys from falling into the 
crankcase.
4. Remove:
Oil delivery pipe “1”
Camshaft cover “2”
(along with the camshafts)
NOTE:
Loosen each bolt 1/4 of a turn at a time, in stag-
es and in a crisscross pattern. After all of the 
bolts are fully loosened, remove them.
EAS23860CHECKING THE CAMSHAFTS
1....

CAMSHAFTS
5-23
3. Measure:
Camshaft journal diameter (crankcase side) 
“a”
Out of specification → Replace the camshaft.
4. Measure:
Camshaft journal diameter (camshaft cover 
side) “a”
Out of specification → Replace the camshaft.
5. Measure:
Crankcase hole inside diameter “a”
Out of specification → Replace the crank-
case.6. Measure:
Camshaft cover hole inside diameter “a”
Out of specification → Replace the camshaft 
cover.
7. Calculate:
Camshaft-to-crankcase clearance
Out of specification → Replace...

CAMSHAFTS
5-24
NOTE:
Calculate the clearance by subtracting the cam-
shaft journal diameter (camshaft cover side) 
from the camshaft cover hole inside diameter.
9. Check:
Camshaft drive gears
Camshaft driven gears
Chips/pitting/roughness/wear → Replace the 
defective part(s).
EAS23890
CHECKING THE ROCKER ARMS AND 
ROCKER ARM SHAFTS
The following procedure applies to all of the 
rocker arms and rocker arm shafts.
1. Check:
Rocker arm
Damage/wear → Replace.
2. Check:
Rocker arm shaft
Blue...

CAMSHAFTS
5-25
EAS23920
CHECKING THE VALVE LIFTERS AND 
VALVE LIFTER CASES
1. Check:
Valve lifter
Blue discoloration/excessive wear/pitting/ 
scratches → Replace and check the lubrica-
tion system.
2. Check:
Valve lifter case “1”
Damage/wear → Replace the valve lifter 
case.
Seal “2”
O-ring “3”
Damage/wear → Replace the O-ring.
3. Measure:
Valve lifter outside diameter “a”
Out of specification → Replace.4. Measure:
Valve lifter case inside diameter “a”
Out of specification → Replace.
5. Calculate:...

CAMSHAFTS
5-26
O-ring
Damage/wear → Replace the oil seal and O-
ring as a set.
EAS23980CHECKING THE DECOMPRESSION SYSTEM
1. Check:
Decompression system
NOTE:
Check the decompression system while the 
decompression push rod is installed in the 
camshaft.
Check that the decompression pin “1” projects 
from the camshaft.
Check that the decompression push rod “2” 
moves smoothly.
2. Check:
Decompression push rods
Bends/damage → Replace.
EAS23990CHECKING THE OIL DELIVERY PIPE
1. Check:
Oil delivery...

CAMSHAFTS
5-27
Align the punch mark “a” on the camshaft drive 
gear “1” with the punch mark “b” on the cam-
shaft driven gear “2”.
Insert a cross-headed screwdriver into one of 
the holes in the outer camshaft driven gear and 
rotate the gear until the teeth of both driven 
gears are aligned. The teeth of both camshaft 
driven gears must be aligned for installation.
5. Tighten:
Camshaft driven gear nut “1”
NOTE:
Place a folded copper washer “2” between the 
teeth of the camshaft drive gear and...

CAMSHAFTS
5-28
CAUTION:
ECA14630
Do not pump the valve lifter excessively.
Kerosene is highly flammable.
b. Install the valve lifter into the engine.
CAUTION:
ECA14650
Be sure to install the valve lifter in its appro-
priate position.
c. Start the engine and warm it up.
d. Stop the engine.
e. Remove the camshaft sprocket cover.
f. Rotate the camshaft until the punch mark “1” 
on the camshaft driven gear aligns with the 
punch mark on the camshaft drive gear as 
shown. This is the condition in which...

CAMSHAFTS
5-29
i. Leave the camshaft drive and driven gears 
aligned for five minutes to allow the valve lift-
er to bleed.
j. If necessary, repeat steps (h) and (i) to bleed 
other valve lifters.
        
EAS24060INSTALLING THE VALVE LIFTERS
1. Install:
Front valve lifter case
Rear valve lifter case
Valve lifters
NOTE:
Install the valve lifter in the correct place.
After installing the valve lifters, fill the tops of 
them with engine oil.
EAS24070INSTALLING THE...

CAMSHAFTS
5-30
c. Install the rocker arm base bolts (M6) “1”, “2” 
and the rocker arm base bolts (M8) “3”.
NOTE:
Tighten the rocker arm base bolts in stages and 
in a crisscross pattern.
Bolts “1”: l = 36 mm (1.42 in)
Bolts “2”: l = 40 mm (1.57 in)
        
EAS24080
INSTALLING THE CYLINDER HEAD 
COVERS
The following procedure applies to both cylin-
ders.
1. Install:
Front cylinder head cover “1”
Rear cylinder head cover “2”
NOTE:
Apply locking agent (LOCTITE®) to the...

CYLINDER HEADS
5-31
EAS24110
CYLINDER HEADS
Removing the cylinder heads
Order Job/Parts to remove Q’ty Remarks
Cylinder head covers/Rocker arms Refer to “CAMSHAFTS” on page 5-16.
1 Front exhaust pipe joint 1
2 Front exhaust pipe joint gasket 1
3 Oil pipe 1 1 From crankcase to cylinder heads.
4 Copper washer 4
5 Copper washer 2
6 Engine temperature sensor 1
7 Rear cylinder head 1
8 Front cylinder head 1
9 Cylinder head gasket 2
10 Dowel pin 4
For installation, reverse the removal 
procedure.
ET R..21 Nm...