Yamaha YZ450FY 2009 Owner's Service Manual page 121

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 diameter 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)
4-20
CARBURETOR