Yamaha YFZ450S 2003 Service Manual page 244

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CARBURETOR
EBS00150
ASSEMBLING THE CARBURETOR
CAUTION:
_
Before reassembling, wash all of the parts
in a clean petroleum based solvent.
1. Install:
• pilot screw 1
NOTE:
_
Before assembling the carburetor, make sure
to turn out the pilot screw the same number of
times, as noted before disassembly, from the
seated position to the set position.
2. Measure:
• float height a
Out of specification → Adjust.
Float height (F.H)
8.0 mm (0.31 in)
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a. Hold the carburetor in an upside down posi-
tion.
b. Measure the distance from the front mating
surface of the float chamber (gasket
removed) to the top of the float.
NOTE:
_
The float arm should be resting on the needle
valve, but not compressing it.
c. If the float height is not within the specifica-
tion, check the valve seat and needle valve.
d. If either is worn, replace the carburetor
assembly.
e. If both are fine, adjust the float height by
bending the float tang 1 on the float.
f. Recheck the float height.
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CARB
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