Yamaha WR250FM service manual Float height Mm 0.31 Measurement and adjustment steps

CARBURETOR

ENG

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, resulting 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 specification, 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.

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