Yamaha YXR660FAS Service Manual download pdf (Page 250)

6 - 10

FUEL

CARBURETOR

8. Check:

• free movement (piston valve)

Sticks → Replace the piston valve guide

and the piston valve.

Insert the piston valve into the carburetor

body, and check for free movement.

9. Check:

• free movement (throttle valve)

Sticks → Replace.

ASSEMBLING THE CARBURETOR

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.

CAUTION:

Before assembling, wash all of the parts in

a clean petroleum based solvent.

1. Measure:

• float height a

Out of specification → Adjust.

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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 them both.

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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Float height (F.H.)

13 mm (0.51 in)

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