Yamaha YXR660FAS Service Manual download pdf (Page 248)

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FUEL

CARBURETOR

DISASSEMBLING THE CARBURETOR

NOTE:

Before disassembling the carburetor, make

sure to note the number of times the pilot

screw is turned out from the seated position to

its set position.

CHECKING THE CARBURETOR

1. Check:

• carburetor body

• float chamber

Cracks/damage → Replace.

• fuel passage

Contamination → Clean as indicated.

• fuel chamber body

Contamination → Clean.

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a. Wash the carburetor in a petroleum based

solvent.

(Do not use any caustic carburetor cleaning

solution.)

b. Blow out all of the passages and jets with

compressed air.

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2. Check:

•float 1

• float tang 2

Damage → Replace.

3. Check:

• needle valve seat 1

• needle valve 2

• O-ring 3

Contamination/wear/damage → Replace as

a set.

NOTE:

Always replace the needle valve and valve

seat as a set.

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