Yamaha WR450F 2003 Manual De Servicio Del Propietario página 326

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Measurement and adjustment steps:

Hold the carburetor in an upside down

Slowly tilt the carburetor in the opposite

direction, then take the measurement

when the needle valve aligns with the float

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.

The float arm should be resting on the nee-

dle valve, but not compressing the needle

If the float height is not within specifica-

tion, inspect the valve seat and needle

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.

Damage → Replace.

Starter plunger

Cold starter plunger 1

Hot starter plunger 2

Wear/damage → Replace.

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