Yamaha YFZ450S 2003 Service Manual page 242

CARBURETOR
EBS00146
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.
EBS00148
CHECKING THE CARBURETOR
1. Check:
• carburetor body
• float chamber
Cracks/damage → Replace.
• fuel passage
Contamination → Clean as indicated.
• fuel chamber body
Contamination → Clean.
M MMM M MMM M M MMM
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.
L LLL L LLL L L LLL
2. Check:
• float 1
• float tang 2
Damage → Replace.
3. Check:
• valve seat
• needle valve 1
Contamination → Clean.
Wear/damage → Replace the carburetor
assembly.
6 - 5
CARB
M M MMM M M MMM M
L L LLL L L LLL L
M MMM M MMM
L LLL L LLL