YAMAHA Marine 100A Manuel D'entretien page 180

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FUEL
CARBURETOR
4090
4100
4110
4120
INSPECTING THE CARBURETOR
CAUTION:
Do not use a steel wire to clean the jets.
This may enlarge the jet diameters and
seriously affect performance.
1. Inspect:
• Carburetor body
Cracks/damage → Replace.
Contamination → Clean.
2. Inspect:
• Pilot screw
Bends/wear → Replace.
3. Inspect:
• Main jet
• Pilot jet
• Pilot air jet
Contamination → Clean.
4. Inspect:
• Needle valve
Grooved wear → Replace.
5. Inspect:
• Float
Cracks/damage → Replace.
ASSEMBLING THE CARBURETOR
1. Install:
• Needle valve
• Float
• Float pin
NOTE:
• When installing the float into the carbure-
tor, place the needle valve into the needle
valve seat.
• After installation, make sure that the float
operates smoothly.
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