Checking The Carburetor - Yamaha YJ50RN Service Manual

CARBURETOR
EAS00485

CHECKING THE CARBURETOR

NOTE:
Before disassembling the carburetor, make
sure to note the number of times the pilot air
screw is turned out from the seated position to
its set position.
1. Check:
• carburetor body
• float chamber
• jet housing
Cracks/damage → Replace.
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 chamber body
Dirt → Clean.
4. Check:
• float chamber rubber gasket
Cracks/damage/wear → Replace.
5. Check:
• float
Damage → Replace.
6. Check:
• needle valve 1
Damage/obstruction/wear → Replace the
needle valve.
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