Yamaha FZS6W 07 User Manual

THROTTLE BODIES
7-6
EAS26980
CHECKING THE INJECTORS
1. Check: InjectorsDamage  → Replace.
EAS26990
CHECKING THE THROTTLE BODIES
1. Check:
 Throttle bodiesCracks/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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3. Check: Fuel...

THROTTLE BODIES
7-7
c. Measure the throttle position sensor volt-age.
d. Adjust the throttle position sensor angle so  that the voltage is within the specified 
range.
e. After adjusting the th rottle position sensor 
angle, tighten the throttle position sensor 
screws.
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 Positive tester probe
Ye l l o w  “ 1 ”
 Negative tester probe Black/Blue “2”
Digital circuit tester90890-03174
Model 88 maltimeter with 
tachometer YU-A1927
Output voltage (at idle)Adjusted by tachometer 

THROTTLE BODIES
7-8 

AIR INDUCTION SYSTEM
7-9
EAS27040
AIR INDUCTION SYSTEM 

AIR INDUCTION SYSTEM
7-10
1. Air cut-off valve
2. Reed valve
3. To air filter case
A. To cylinder #1 and #2
B. To cylinder #3 and #4 

AIR INDUCTION SYSTEM
7-11
Removing the air cut-off valve assembly and hoses
Order Job/Parts to remove Q’ty RemarksSeat Refer to GENERAL CHASSIS on page 4-1.
Left front cowling inner panel (with cowling) Refer to GENERAL CHASSIS on page 4-1.
Right front cowling inner panel (with cowlin g) Refer to GENERAL CHASSIS on page 4-1.
Fuel tank Refer to FUEL TANK on page 7-1.
Battery Refer to GENERAL CHASSIS on page 4-1.
Air filter case Refer to GENERAL CHASSIS on page 4-1.
Battery box and battery box bracket...

AIR INDUCTION SYSTEM
7-12
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
7-13 

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

CHECKING THE RELAY UNIT (DIODE) .............................................. 8-72
CHECKING THE SPARK PLUG CAPS ................................................ 8-73
CHECKING THE IGNITION COILS ...................................................... 8-74
CHECKING THE CRANKSHAFT POSITION SENSOR ....................... 8-75
CHECKING THE LEAN ANGLE SENSOR ........................................... 8-75
CHECKING THE STARTOR MOTOR OPERATION ............................. 8-75
CHECKING THE STATOR COIL...