Yamaha WR250F(N), Owner'S Service Manual

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ENG
CARBURETOR
Float height
1. Measure:
●
Float height
a
Out of specification
→
Adjust.
Float height:
8.0 mm (0.31 in)
Measurement and adjustment steps:
●
Hold the carburetor in an upside down
position.
NOTE:
●
Slowly tilt the carburetor in the opposite
direction, then take the measurement
when the needle valve aligns with the float
arm.
●
If the carburetor is level, the weight of the
float will push in the needle valve, result-
ing in an incorrect measurement.
●
Measure the distance between the mating
surface of the float chamber and top of the
float using a vernier calipers.
NOTE:
The float arm should be resting on the nee-
dle valve, but not compressing the needle
valve.
●
If the float height is not within specifica-
tion, inspect the valve seat and needle
valve.
●
If either is worn, replace them both.
●
If both are fine, adjust the float height by
bending the float tab
b
on the float.
●
Recheck the float height.
EC464600
Float
1. Inspect:
●
Float 1
Damage
→
Replace.