Yamaha F20A, Service Manual

Page: 106 / 444

4-8
FUEL
E
CARBURETOR
SERVICE POINTS
CAUTION:
Do not use a steel wire to clean the jets.
This may enlarge the jet diameters and
seriously affect performance.
Carburetor inspection
1. Inspect:
●
Carburetor body
Cracks/damage
→
Replace.
Contamination
→
Clean.
2. Inspect:
●
Main jet
●
Pilot jet
●
Main nozzle
Contamination
→
Clean.
3. Inspect:
●
Needle valve
Grooved wear
→
Replace.
4. Inspect:
●
Float
Cracks/damage
→
Replace.
Carburetor
1. Install:
●
Needle valve
●
Float 1
●
Float pin 2
●
Screw 3
NOTE:
●
When installing the float into the carbure-
tor, place the needle valve into the needle
valve seat.
●
The float pin should fit into the slit in the
carburetor and be retained with the screw.
●
After installation, make sure the float
operates smoothly.