Yamaha yz250 2015, Owner'S Manual

Page: 75 / 174

4-11
CARBURETOR AND REED VALVE
4. Install:
• Starter plunger "1"
5. Install:
• Pilot jet "1"
• Main jet "2"
6. Install:
• Needle valve "1"
• Float "2"
• Float pin "3"
• After installing the needle valve to
the float, install them to the carbure-
tor.
• Check the float for smooth move-
ment.
7. Install:
• Float chamber "1"
• Plate "2"
• Screw (float chamber) "3"
8. Install:
• Air vent hose [L=580 mm (22.8
in)] "1"
• Air vent hose [L=400mm (15.7 in)]
"2"
• Overflow hose [L=280mm (11.0
in)] "3"
• Clamp "4"
Refer to "CABLE ROUTING DIA-
GRAM" section in the CHAPTER
2.
Install the air vent hoses and overflow
hose to the carburetor with their ends
not having the cuts "a" toward the car-
buretor.
9. Install:
• Jet needle "1"
• Collar "2"
• Spring "3"
• Needle holder "4"
To throttle valve "5".
Install the spring with its smaller dia.
"a" facing the collar.
10. Install:
• Throttle cable "1"
• Locknut "2"
• Mixing chamber top "3"
• Spring (throttle valve) "4"
• Ring "5"
• Throttle valve "6"
• While compressing the spring, con-
nect the throttle cable.
• Align the projection "a" on the ring
with the groove "b" in the needle
holder "7".
11. Install:
• Mixing chamber top "1"
• Screw (mixing chamber top) "2"
To carburetor "3".
• Insert the throttle valve into the car-
buretor body while pulling up the le-
ver "4".
• After installing, check the throttle
grip for smooth movement.
INSTALLING THE CARBURETOR
1. Install:
• Carburetor "1"
Install the projection between the car-
buretor joint slots.
2. Tighten:
• Screw (carburetor joint) "1"
Locknut:
4 Nm (0.4 m•kg, 2.9
ft•lb)