Checking The Carburetor; Assembling The Carburetor - Yamaha F40BMHD Service Manual

FUEL
3
CARBURETOR
1
2

CHECKING THE CARBURETOR

CAUTION:
Do not use a steel wire to clean the jets.
This may enlarge the jet diameters and seri-
ously affect performance.
1. Check:
• Carburetor body
Cracks/damage → Replace.
Contamination → Clean.
2. Check:
• Main jet
• Pilot jet
• Main nozzle
Contamination → Clean.
3. Check:
• Needle valve
Grooved wear → Replace.
4. Check:
• Float
Cracks/damage → Replace.
5. Check:
• Pilot screw
Damage → Replace.

ASSEMBLING THE CARBURETOR

1. Install:
• Needle valve
1
• Float
• Float pin
• Screw
NOTE:
• The float pin should fit into the slit in
the carburetor and be retained with the
screw.
• When installing the float into the carbu-
retor, place the needle valve into the
needle valve seat.
• After installation, make sure that the
float operates smoothly.
4-11
2
3
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