2014 YAMAHA WR 250F Owners Manual

Page 105 of 230

YAMAHA WR 250F 2014  Owners Manual 5-4
CARBURETOR
CARBURETOR
REMOVING THE CARBURETOR
Order Part name Qty Remarks
Seat and fuel tank Refer to "REMOVING THE SEAT, FUEL 
TANK AND SIDE COVERS" section in the 
CHAPTER 3.
Rear shock absorbe

Page 106 of 230

YAMAHA WR 250F 2014  Owners Manual 5-5
CARBURETOR
DISASSEMBLING THE CARBURETOR
Order Part name Qty Remarks
1 Carburetor breather hose 4
2 Valve lever housing cover 1
3 Screw (throttle shaft) 1
4 Throttle valve 1
5 Needle holder 1
6 Je

Page 107 of 230

YAMAHA WR 250F 2014  Owners Manual 5-6
CARBURETOR
19 Main jet 1
20 Needle jet 1
21 Spacer 1
22 Pilot jet 1
23 Starter jet 1
24 Push rod 1 Pull the push rod.
25 Throttle shaft assembly 1
26 Push rod link lever assembly 1
27 Main air jet

Page 108 of 230

YAMAHA WR 250F 2014  Owners Manual 5-7
CARBURETOR
HANDLING NOTE
Do not loosen the screw (throttle 
position sensor) "1" except when 
changing the throttle position sen-
sor due to failure because it will 
cause a drop in engine perfor-

Page 109 of 230

YAMAHA WR 250F 2014  Owners Manual 5-8
CARBURETOR
e. If both are fine, adjust the float 
height by bending the float tab "b" 
on the float.
f. Recheck the float height.
CHECKING THE FLOAT
1. Inspect:
• Float "1"
Damage→Replace.
CHE

Page 110 of 230

YAMAHA WR 250F 2014  Owners Manual 5-9
CARBURETOR
8. Install:
• Throttle shaft assembly "1"
• Washer (metal) "2"
• Washer (resin) "3"
• Valve lever "4"
• Apply the fluorochemical grease on 
the bearings.
• Fit the projectio

Page 111 of 230

YAMAHA WR 250F 2014  Owners Manual 5-10
CARBURETOR
16. Install:
• Jet needle "1"
•Collar "2"
• Spring "3"
• Needle holder "4"
• Throttle valve plate "5"
To throttle valve "6".
17. Install:
• Throttle valve assembly "1"
•

Page 112 of 230

YAMAHA WR 250F 2014  Owners Manual 5-11
CARBURETOR
6. Adjust:
• Throttle grip free play
Refer to "ADJUSTING THE 
THROTTLE GRIP FREE PLAY" 
section in the CHAPTER 3.
7. Install:
• Throttle cable cover "1"
• Bolt (throttle cable co