Yamaha YFM660FS, Supplementary Service Manual

Page: 325 / 478

6 - 4
CARB
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.
*****************************************************
Cleaning steps:
●
Wash the carburetor in a petroleum based
solvent.
(Do not use any caustic carburetor cleaning
solution.)
●
Blow out all of the passages and jets with
compressed air.
*****************************************************
2.Check:
●
Float
1
●
Float tang
2
Damage
→
Replace.
3.Check:
●
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.