Checking The Check Valve; Checking The Fuel Filters; Checking The Carburetor - Yamaha F100C Service Manual

FUEL

Checking the check valve

1. Install the special service tool onto the
check valve.
Vacuum/pressure pump gauge set:
90890-06756
2. Apply pressure to each check valve port.
Replace if necessary.
NOTE:
Make sure that no air comes out of the oppo-
site side of the check valve.

Checking the fuel filters

1. Check the fuel filters for dirt or residue.
Clean if necessary.
4-15
Fuel system
S60C4160

Checking the carburetor

1. Check the air and fuel passages, and jets
for dirt and foreign matter. Clean the car-
buretor body with a petroleum based sol-
vent if necessary.
2. Blow compressed air into all passages
and jets.
CAUTION:
• Direct the compressed air downward,
otherwise cleaning solvent may be
blown into your eyes or small parts of
the carburetor may be blown off.
• Do not use steel wire for cleaning the
jets, otherwise the jet diameters may be
enlarged, which may seriously affect
performance.
3. Check the main jet 1, pilot jet 2, and
main nozzle 3 for dirt or residue. Clean if
necessary.
S60C4180
60C5D11