Checking The Carburetor - Yamaha YFM4FAR Service Manual

CARBURETOR

CHECKING THE CARBURETOR

1.Check:
Carburetor body
G
Float chamber
G
Cracks/damage → Replace.
Fuel passage
G
Contamination → Clean as indicated.
Carburetor body
G
Contamination → Clean.
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Cleaning steps:
G
Wash the carburetor in a petroleum-based
solvent.
(Do not use any caustic carburetor cleaning
solution.)
G
Blow out all of the passages and jets with
compressed air.
*****************************************************
2.Check:
Float 1
G
Float tang 2
G
Damage → Replace.
3.Check:
Valve seat 1
G
Needle valve 2
G
O-ring 3
G
Contamination/wear/damage → Replace as
a set.
NOTE:
Always replace the needle valve and valve
seat as a set.
4.Check:
Piston valve 1
G
Scratches/wear/damage → Replace.
Rubber diaphragm 2
G
Tears → Replace.
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CARB