Checking The Carburetor - Yamaha 2009 YFM25RY Service Manual

EAS26760

CHECKING THE CARBURETOR

1. Check:
• Carburetor body
• Float chamber
Cracks/damage → Replace.
• Float chamber body
Contamination → Clean.
2. Check:
• Fuel passages
Obstruction → 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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3. Check:
• Float "1"
• Float Tang "2"
Damage → Replace.
4. Check:
• Needle valve seat "1"
• Needle valve "2"
Contamination → Clean.
Damage/obstruction/wear → Replace the
needle valve, needle valve seat and O-
ring as a set.
TIP
Always replace the valve seat, needle valve
and O-ring as a set.
5. Check:
• Piston valve "1"
Damage/scratches/wear → Replace.
• Piston valve diaphragm "2"
Cracks/tears → Replace.
6. Check:
• Cover "1"
• Diaphragm spring "2"
Cracks/damage → Replace.
7. Check:
• Coasting enricher diaphragm "1"
• Spring "2"
Cracks/damage → Replace.
6-6
CARBURETOR