Yamaha 2003 YZ450FR Owner's Service Manual page 124

4
CARBURETOR
11. Install:
Needle valve 1
G
Float 2
G
Float pin 3
G
NOTE:
After installing the needle valve to the float,
G
install them to the carburetor.
Check the float for smooth movement.
G
12. Install:
Pilot screw 1
G
Spring 2
G
Washer 3
G
O-ring 4
G
Note the following installation points:
Turn in the pilot screw until it is lightly
G
seated.
Turn out the pilot screw by the number of
G
turns recorded before removing.
13. Install:
O-ring
3
G
Float chamber 1
G
1
Screw (float chamber) 2
G
Cable holder (throttle stop screw cable)
G
2
3
4
Hose holder (carburetor breather hose)
G
4
14. Install:
Diaphragm (accelerator pump) 1
G
Spring 2
G
O-ring 3
G
Cover 4
G
Hose holder (drain hose) 5
G
Screw (cover) 6
G
NOTE:
Install the diaphragm (accelerator pump) with
its mark a facing the spring.
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ENG
Pilot screw:
2 turns out (example)