Yamaha YFM4FAR, Service Manual

Page: 243 / 397

6 - 7
CARB
CARBURETOR
ADJUSTING THE FUEL LEVEL
1.Measure:
●
Fuel level
a
Out of specification
→
Adjust.
Fuel level:
4.0 ~ 5.0 mm (0.16 ~ 0.20 in)
Above the float chamber mating
surface
*****************************************************
Measurement and adjustment steps:
●
Place the machine on a level surface.
●
Connect the fuel level gauge
1
to the drain
pipe
2
.
●
Loosen the drain screw
3
.
●
Hold the gauge vertically next to the float
chamber line.
●
Measure the fuel level
a
with the gauge.
●
If the fuel level is incorrect, adjust the fuel
level.
●
Remove the carburetor.
●
Check the valve seat and needle valve.
●
If either is worn, replace them both.
●
If both are fine, adjust the float level by
bending the float tang
4
slightly.
●
Install the carburetor.
●
Recheck the fuel level.
*****************************************************
Fuel level gauge:
P/N. YM-01312-A, 90890-01312