Removing The Throttle Body; Checking The Injector; Checking The Throttle Body - Yamaha WR450FB 2012 Owner's Service Manual

EAS1DX3207

REMOVING THE THROTTLE BODY

The following procedure applies to both of the
throttle body.
1. Remove:
• Rear frame upper bolt
• Rear shock absorber assembly upper bolt
Refer to "REAR SHOCK ABSORBER AS-
SEMBLY" on page 5-61.
2. Loosen:
• Rear frame lower bolt
• Rear shock absorber assembly lower bolt
3. Slide:
• Rear frame
• Rear shock absorber assembly
ECA1DX1026
NOTICE
Do not strain the wire harness when the rear
frame and rear shock absorber assembly
are removed.
4. Loosen:
• Throttle body joint clamp screw
5. Remove:
• Throttle body
TIP
Remove the throttle body from the right side of
the vehicle.
EAS26980

CHECKING THE INJECTOR

1. Check:
• Injector
Obstruction Replace and check the fuel
pump/fuel supply system.
Deposit Replace.
Damage Replace.
2. Check:
• Injector resistance
Refer to "CHECKING THE FUEL INJEC-
TOR" on page 9-78.
EAS26990

CHECKING THE THROTTLE BODY

1. Check:
• Throttle body
Cracks/damage Replace the throttle body
as a set.
2. Check:
• Fuel passages
Obstructions Clean.
ECA1DX1027
NOTICE
• Before removing the throttle body, clean
the area around the throttle body to pre-
vent dirt and other foreign material from
falling into the engine.
• If the throttle body is subject to strong
shocks or dropped during cleaning, re-
place it.
• Do not use any caustic carburetor clean-
ing solution.
• Do not directly push the throttle valves to
open them.
• Do not loosen the throttle valve stopper
screw "1", throttle valve pulley nut "2", or
throttle valve screw "3". Otherwise, a loss
of performance may occur.
• Do not use compressed air to clean the
throttle body. Otherwise, foreign material
may adhere to the intake air pressure sen-
sor passage "a" and fuel injector "b" in the
throttle body.
2
a
8-8
THROTTLE BODY
1
3
b