Yamaha YZ250N Owner's Service Manual page 240

CARBURETOR AND REED VALVE
4-15
8. Install:
9Air vent hose [R=580 mm (22.8 in)] 1
9Air vent hose [R=400mm (15.7 in)] 2
9Overflow hose [R=280mm (11.0 in)] 3
9Clamp 4
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:
9Jet needle 1
9Collar 2
9Spring 3
9Needle holder 4
To throttle valve 5.
NOTE:
Install the spring with its smaller dia. a facing
the collar.
10. Install:
9Throttle cable 1
9Mixing chamber top 2
9Spring (throttle valve) 3
9Ring 4
9Throttle valve 5
NOTE:
9While compressing the spring, connect the
throttle cable.
9Align the projection a on the ring with the
groove b in the needle holder 6.
ENG