Yamaha YZ250F(S) Owner's Service Manual page 288

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CARBURETOR
15. Install:
Jet needle 1
G
Collar 2
G
Spring 3
G
Needle holder 4
G
Throttle valve plate 5
G
To throttle valve 6.
16. Install:
Throttle valve assembly 1
G
Screw (throttle shaft) 2
G
NOTE:
Install the valve lever rollers 3 into the slits a
of the throttle valve.
17. Install:
O-ring 1
G
Valve lever housing cover 2
G
Bolt (valve lever housing cover) 3
G
18. Install:
Carburetor breather hose 1
G
NOTE:
Install the carburetor breather hoses to the
carburetor so that the hoses do not bend near
where they are installed.
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:
1.25 mm (0.049 in)
ENG