Yamaha WR450F, Owner'S Service Manual

Page: 358 / 794

4 - 19
ENG
CARBURETOR
16. Install:
• Throttle valve assembly
1
• Screw (throttle shaft)
2
NOTE:
Install the valve lever rollers
3
into the slits
a
of the throttle valve.
17. Install:
• O-ring
1
• Valve lever housing cover
2
• Bolt (valve lever housing cover)
3
18. Install:
• Carburetor breather hose
1
Refer to “CABLE ROUTING DIAGRAM”
section in the CHAPTER 2.
Accelerator pump timing adjustment
Adjustment steps:
NOTE:
In order for the throttle valve height
a
to
achieve the specified value, tuck under the
throttle valve plate
1
the rod
2
etc. with the
same outer diameter as the specified value.
Throttle valve height:
3.1 mm (0.122 in)
• Fully turn in the accelerator pump adjust-
ing screw
3
.
• Check that the link lever
4
has free play
b
by pushing lightly on it.
• Gradually turn out the adjusting screw
while moving the link lever until it has no
more free play.