Yamaha YZ450F(Y Owner's Manual page 83

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:
1.25 mm (0.049 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"
Carburetor joint:
10 Nm (1.0 m•kg, 7.2
ft•lb)
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)
5. Install:
• Throttle cable (pull) "1"
Throttle cable (pull):
4 Nm (0.4 m•kg, 2.9
ft•lb)
• Throttle cable (return) "2"
Throttle cable (return):
11 Nm (1.1 m•kg, 8.0
ft•lb)
4-13
CARBURETOR
6. Adjust:
• Throttle grip free play
Refer to "ADJUSTING THE
THROTTLE CABLE FREE PLAY"
section in the CHAPTER 3.
7. Install:
• Throttle cable cover "1"
• Bolt (throttle cable cover) "2"
Bolt (throttle cable cov-
er):
4 Nm (0.4 m•kg, 2.9
ft•lb)
8. Install:
• Throttle position sensor lead cou-
pler "1"
• Clamp "2"
Refer to "CABLE ROUTING DIA-
GRAM" section in the CHAPTER
2.