Accelerator Pump Timing Adjustment - Yamaha WR450F(V) Owner's Service Manual

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.
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ENG