Yamaha Yzf R1 2007 Manual

THROTTLE BODIES
7-5
Removing the injectors
Order Job/Parts to remove Q’ty Remarks
1 Intake air pressure sensor coupler 1 Disconnect.
2 Cylinder #1-injector coupler 1 Disconnect.
3 Cylinder #2-injector coupler 1 Disconnect.
4 Cylinder #3-injector coupler 1 Disconnect.
5 Cylinder #4-injector coupler 1 Disconnect.
6 Sub-wire harness 1
7 Negative pressure hose 1 Disconnect.
8 Intake air pressure sensor 1
9Fuel distributor 1
10 Injector 4
11 Throttle position sensor (for throttle valves) 1
12 Throttle...

THROTTLE BODIES
7-6
EAS26980
CHECKING THE INJECTORS
1. Check:
 Injectors
Damage → Replace.
EAS26990
CHECKING THE THROTTLE BODIES
1. Check:
 Throttle bodies
Cracks/damage → Replace the throttle 
bodies as a set.
2. Check:
 Fuel passages
Obstructions → Clean.
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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 com-
pressed air.
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EAS4S81001...

THROTTLE BODIES
7-7
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a. Temporary tighten the throttle position sen-
sor (for throttle valves).
b. Check that the throttle valves are fully 
closed.
c. Connect the throttle position sensor (for 
throttle valves), throttle position sensor (for 
throttle cable pulley) and throttle servo 
motor to the wire harness.
d. Turn the main switch to “OFF” and set the 
engine stop switch to “ON”.
e. Simultaneously press and hold the 
“SELECT” and “RESET” buttons, turn the 
main switch...

THROTTLE BODIES
7-8
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AIR INDUCTION SYSTEM
7-9
EAS27040
AIR INDUCTION SYSTEM
Removing the air cut-off valve assembly and hoses
Order Job/Parts to remove Q’ty Remarks
1 Air cut-off valve coupler 1 Disconnect.
2 Air cut-off valve hose 1 1 Disconnect.
3 Air cut-off valve hose 2 1 Disconnect.
4 Air cut-off valve hose 3 1 Disconnect.
5 Air cut-off valve 1
6 Reed valve cap 2
7 Reed valve assembly 2
8Plate 4
For installation, reverse the removal proce-
dure. 

AIR INDUCTION SYSTEM
7-10
EAS27060
CHECKING THE AIR INDUCTION SYSTEM
Air injection
The air induction system burns unburned 
exhaust gases by injecting fresh air (second-
ary air) into the exhaust port, reducing the 
emission of hydrocarbons. When there is neg-
ative pressure at the exhaust port, the reed 
valve opens, allowing secondary air to flow into 
the exhaust port. The required temperature for 
burning the unburned exhaust gases is 
approximately 600 to 700°C.
Air cut-off valve
The air cut-off...

AIR INDUCTION SYSTEM
7-11 

ELECTRICAL SYSTEM
IGNITION SYSTEM....................................................................................... 8-1
CIRCUIT DIAGRAM............. ................................................................... 8-1
TROUBLESHOOTING ............................................................................ 8-3
ELECTRIC STARTING SYSTEM .................................................................. 8-5
CIRCUIT DIAGRAM................

ELECTRICAL COMPONENTS................................................................... 8-77
CHECKING THE SWITCHES............................................................... 8-81
CHECKING THE BULBS AND BULB SOCKETS ................................. 8-84
CHECKING THE FUSES...................................................................... 8-85
CHECKING AND CHARGING THE BATTERY ..................................... 8-85
CHECKING THE RELAYS...

IGNITION SYSTEM
8-1
EAS27090
IGNITION SYSTEM
EAS27110
CIRCUIT DIAGRAM