Yamaha YZ250 Owner's Service Manual page 246

CARBURETOR AND REED VALVE
4-15
7. Install:
9 Float chamber 1
9 Plate 2
9 Screw (float chamber) 3
8. Install:
9 Air vent hose [/=580 mm (22.8 in)] 1
9 Air vent hose [/=400mm (15.7 in)] 2
9 Overflow hose [/=280mm (11.0 in)] 3
9 Clamp 4
Refer to "CABLE ROUTING DIAGRAM"
section in the CHAPTER 2.
NOTE:
Install the air vent hoses and overflow hose to
the carburetor with their ends not having the
cuts a toward the carburetor.
9. Install:
9 Jet needle 1
9 Collar 2
9 Spring 3
9 Needle holder 4
To throttle valve 5.
NOTE:
Install the spring with its smaller dia. a facing
the collar.
ENG