Yamaha Mt 01 T 2005 Manual

							FUEL TANK
6-3
CAUTION:
EC5YU1017
When installing the fuel hose and the fuel re-
turn hose, make sure that they are securely 
connected, and that the fuel hose connector 
cover on the fuel hose is in the correct posi-
tion, otherwise the fuel hose will not be prop-
erly installed.
NOTE:
Install the fuel hose securely onto the fuel 
pump until a distinct “click” is heard.
To install the fuel hose onto the fuel pump, 
slide the fuel hose connector cover “1” on the 
end of the hose in the direction of the arrow 
shown.
1 
						

							THROTTLE BODIES
6-4
EAS26970
THROTTLE BODIES
Removing the pressure regulator and rollover valves
Order Job/Parts to remove Q’ty Remarks
Fuel tank Refer to “FUEL TANK” on page 6-1.
Air ductRefer to “GENERAL CHASSIS” on page 
4-1.
1 Pressure regulator cover 1
2Fuel hose (intake manifold assembly to 
pressure regulator)1 Disconnect.
3 Pressure regulator 1
4 Fuel return hose 1
5 Fuel pipe holder 2
6 Fuel return hose (fuel return pipe to fuel pump) 1
7 Fuel return pipe 1
8 Fuel tank breather hose 1
9 Fuel tank overflow hose 1
10 Fuel tank breather/overflow hose holder 1
11 Fuel tank breather/overflow hose 1
12 Rollover valve hose 4
13 Rollover valve 1 1
T R..7 Nm (0.7 m • 
kg, 5.1 ft • Ib)
T R..7 Nm (0.7 m • 
kg, 5.1 ft • Ib)
T R..9 Nm (0.9 m • 
kg, 6.5 ft • Ib)
6
7 5
5
10 8
9
1315
14
12
1212 12
11 24 3
1 
						

							THROTTLE BODIES
6-5
14 Rollover valve 2 1
15 Rollover valve bracket 1
For installation, reverse the removal 
procedure.
Removing the pressure regulator and rollover valves
Order Job/Parts to remove Q’ty Remarks
T R..7 Nm (0.7 m • 
kg, 5.1 ft • Ib)
T R..7 Nm (0.7 m • 
kg, 5.1 ft • Ib)
T R..9 Nm (0.9 m • 
kg, 6.5 ft • Ib)
6
7 5
5
10 8
9
1315
14
12
1212 12
11 24 3
1 
						

							THROTTLE BODIES
6-6
Removing the throttle bodies
Order Job/Parts to remove Q’ty Remarks
Seat/Air filter caseRefer to “GENERAL CHASSIS” on page 
4-1.
Fuel tank Refer to “FUEL TANK” on page 6-1.
1 Throttle position sensor coupler 1 Disconnect.
2 Cylinder-#1 intake air pressure sensor hose 1 Disconnect.
3 Cylinder-#2 intake air pressure sensor hose 1 Disconnect.
4Intake solenoid vacuum hose (one-way valve to 
throttle body)1 Disconnect.
5 Throttle cable 2 Disconnect.
6 Throttle body joint clamp screw 2 Loosen.
7 Throttle body 1
CAUTION:
EC5YU1030
The throttle body should not be disassembled.
8 Throttle position sensor 1
For installation, reverse the removal 
procedure.
LS
5
7
8
6 6
3
1
4 2
T R..4 Nm (0.4 m • 
kg, 2.9 ft • Ib)
T R..4 Nm (0.4 m • 
kg, 2.9 ft • Ib)
T R..4 Nm (0.4 m • 
kg, 2.9 ft • Ib) 
						

							THROTTLE BODIES
6-7
Removing the intake manifolds
Order Job/Parts to remove Q’ty Remarks
1 Fuel hose 1
2Fuel hose (intake manifold assembly to 
pressure regulator)1
3Cylinder-#2 ISC (idle speed control) unit outlet 
hose1
4Cylinder-#1 ISC (idle speed control) unit outlet 
hose1
5 Intake manifold assembly 1
6 Cylinder-#2 injector coupler 1 Disconnect.
7 Cylinder-#1 injector coupler 1 Disconnect.
8Gasket 2
For installation, reverse the removal 
procedure.
3
4
6 7 8
5 8
1 2
T R..10 Nm (1.0 m • 
kg, 7.2 ft • Ib)
New
New(2)
(2) 
						

							THROTTLE BODIES
6-8
Removing the injectors
Order Job/Parts to remove Q’ty Remarks
1 Fuel pipe 1
2 Injector joint 1 1
3 Injector joint 2 1
4Injector 2
5 Intake manifold 2
For installation, reverse the removal 
procedure.
2
4
341
T R..30 Nm (3.0 m • 
kg, 22 ft • Ib)
New
New
New
New
New
New
New
New5
5
T R..5 Nm (0.5 m • 
kg, 3.6 ft • Ib)
T R..5 Nm (0.5 m • 
kg, 3.6 ft • Ib) 
						

							THROTTLE BODIES
6-9
EAS26980CHECKING THE INJECTORS
1. Check:
Injectors
Damage → Replace.
EAS26990
CHECKING THE THROTTLE BODIES
1. Check:
Throttle bodies
Cracks/damage → Replace the throttle bod-
ies as a set.
2. Check:
Fuel passages
Obstructions → Clean.



 





 
 








 
 



 
 



 



a. Wash the throttle bodies in a petroleum-
based solvent.
Do not use any caustic carburetor cleaning 
solution.
b. Blow out all of the passages with compressed 
air.
        
ET5YU1014CHECKING THE ROLLOVER VALVES
1. Check:
Rollover valve 1 “1”
Rollover valve 2 “2”
Damage/faulty → Replace.
NOTE:
Check that air flows smoothly only in the direc-
tion of the arrow shown in the illustration.
The rollover valves must be in an upright posi-
tion when checking the airflow.
EAS27000
CHECKING THE PRESSURE REGULATOR
1. Check:
Pressure regulator
Damage → Replace.
EAS27010CHECKING THE PRESSURE REGULATOR 
OPERATION
1. Check:
Pressure regulator operation



 





 
 



 
 



 
 



 
 



 



a. Remove the pressure regulator cover.
Refer to “THROTTLE BODIES” on page 6-4.
b. Disconnect the fuel hose “1” from the pres-
sure regulator “2”.
c. Connect the fuel pressure adapter “3” be-
tween the fuel hose “1” and pressure regula-
tor “2”.
d. Connect the pressure gauge “4” to the fuel 
pressure adapter “3”.
e. Connect the vacuum/pressure pump gauge 
set “5” to the pressure regulator.
f. Start the engine.
g. Measure the fuel pressure.
2 1
 
Vacuum/pressure pump gauge 
set
90890-06756
Pressure gauge
90890-03153
Fuel pressure adapter
90890-03176
YM-03176
 
Fuel pressure
392 kPa (3.92 kg/cm², 55.7 psi)
2
1
4
2
5
3
1 
						

							THROTTLE BODIES
6-10
h. Use the vacuum/pressure pump gauge set to 
adjust the fuel pressure in relation to the vac-
uum pressure as described below.
NOTE:
The vacuum pressure should not exceed 100 
kPa (760 mm Hg).
Faulty → Replace the pressure regulator.
        
EAS27030ADJUSTING THE THROTTLE POSITION 
SENSOR
1. Check:
Throttle position sensor
Refer to “CHECKING THE THROTTLE PO-
SITION SENSOR” on page 7-104.
2. Adjust:
Throttle position sensor angle



 





 
 








 
 



 
 



 



a. Connect the throttle position sensor coupler 
to the throttle position sensor.
b. Connect the digital circuit tester to the throttle 
position sensor coupler.
c. Measure the throttle position sensor voltage.
d. Adjust the throttle position sensor angle so 
that the voltage is within the specified range.
e. After adjusting the throttle position sensor an-
gle, tighten the throttle position sensor 
screws “3”.
          
ET5YU1016
INSTALLING THE FUEL PIPE
1. Install:
Fuel pipe “1”
NOTE:
Install the fuel pipe “1” so that it contacts the pro-
jections “a” on the injector joints. Increase the vacuum pressure →
Fuel pressure is decreased
Decrease the vacuum pressure →
Fuel pressure is increased
Positive tester probe
yellow terminal “1”
Negative tester probe
black terminal “2”
 
Digital circuit tester
90890-03174
 
Throttle position sensor voltage
0.63–0.73 V
T R.. 
Fuel pipe bolt
30 Nm (3.0 m·kg, 22 ft·lb)
2
13
3
a
1 
						

							ISC (IDLE SPEED CONTROL) UNIT
6-11
ET5YU1012
ISC (IDLE SPEED CONTROL) UNIT
Removing the ISC (idle speed control) unit and intake solenoid
Order Job/Parts to remove Q’ty Remarks
Fuel tank Refer to “FUEL TANK” on page 6-1.
Air filter caseRefer to “GENERAL CHASSIS” on page 
4-1.
1 ISC (idle speed control) unit cover 1
2 Surge tank 1
3 Surge tank hose 1
4Intake solenoid vacuum hose (one-way valve to 
throttle body)1 Disconnect.
5One-way valve 1
6Intake solenoid vacuum hose (intake solenoid to 
one-way valve)1
7Intake solenoid vacuum hose (air filter case 
valve to intake solenoid)1
8 Intake solenoid coupler 1 Disconnect.
9 Intake solenoid 1
10 Intake solenoid holder 1
11 Intake solenoid bracket 1
13
12
14
1615
9
102
1311
654
87
T R..7 Nm (0.7 m • 
kg, 5.1 ft • Ib)
T R..10 Nm (1.0 m • 
kg, 7.2 ft • Ib)
T R..9 Nm (0.9 m • 
kg, 6.5 ft • Ib) 
						

							ISC (IDLE SPEED CONTROL) UNIT
6-12
12 ISC (idle speed control) unit coupler 1 Disconnect.
13Cylinder-#1 ISC (idle speed control) unit outlet 
hose1 Disconnect.
14Cylinder-#2 ISC (idle speed control) unit outlet 
hose1 Disconnect.
15 ISC (idle speed control) unit inlet hose 1
16 ISC (idle speed control) unit 1
For installation, reverse the removal 
procedure.
Removing the ISC (idle speed control) unit and intake solenoid
Order Job/Parts to remove Q’ty Remarks
13
12
14
1615
9
102
1311
654
87
T R..7 Nm (0.7 m • 
kg, 5.1 ft • Ib)
T R..10 Nm (1.0 m • 
kg, 7.2 ft • Ib)
T R..9 Nm (0.9 m • 
kg, 6.5 ft • Ib)