Adjusting The Accelerator Pump Timing; Installing The Carburetor - Yamaha WR450F(Y) 2009 Owner's Service Manual

16. Install:
• Jet needle "1"
• Collar "2"
• Spring "3"
• Needle holder "4"
• Throttle valve plate "5"
To throttle valve "6".
17. Install:
• Throttle valve assembly "1"
• Screw (throttle shaft) "2"
Install the valve lever rollers "3" into
the slits "a" of the throttle valve.
18. Install:
• O-ring "1"
• Valve lever housing cover "2"
• Bolt (valve lever housing cover)
"3"
19. Install:
• Carburetor breather hose "1"
Install the carburetor breather hoses
to the carburetor so that the hoses do
not bend near where they are in-
stalled.
ADJUSTING THE ACCELERATOR
PUMP TIMING
Adjustment steps:
In order for the throttle valve height
"a" to achieve the specified value,
tuck under the throttle valve plate "1"
the rod "2" etc. with the same outer di-
ameter as the specified value.
Throttle valve height:
3.1 mm (0.122 in)
a. Fully turn in the accelerator pump
adjusting screw "3".
b. Check that the link lever "4" has
free play "b" by pushing lightly on
it.
c. Gradually turn out the adjusting
screw while moving the link lever
until it has no more free play.

INSTALLING THE CARBURETOR

1. Install:
• Carburetor joint "1"
• Bracket (cylinder head breather
pipe) "2"
• Bolt (carburetor joint) "3"
Bolt (carburetor joint):
10 Nm (1.0 m•kg, 7.2
ft•lb)
• Cylinder head breather pipe "4"
• Cylinder head breather hose 1 "5"
• Cylinder head breather hose 2 "6"
• Cylinder head breather hose 3 "7"
5-11
CARBURETOR
2. Install:
• Carburetor "1"
Install the projection "a" between the
carburetor joint slots.
3. Install:
• Hot starter plunger "1"
Hot starter plunger:
2 Nm (0.2 m•kg, 1.4
ft•lb)
4. Tighten:
• Bolt (carburetor joint) "1"
Bolt (carburetor joint):
3 Nm (0.3 m•kg, 2.2
ft•lb)
• Bolt (air filter joint) "2"
Bolt (air filter joint):
3 Nm (0.3 m•kg, 2.2
ft•lb)