Measuring And Adjusting The Fuel Level - Yamaha YZ125X 2022 Owner's Service Manual

4. Adjust:
• Idle speed
Refer to "CHECKING THE ENGINE IDLING
SPEED" on page 3-5.
EAM30579
MEASURING AND ADJUSTING THE FUEL
LEVEL
1. Measure:
• Fuel level "a"
Out of specification  Adjust.
Fuel level (using fuel level gauge)
9.5–10.5 mm (0.37–0.41 in)
Above the float chamber mating
surface
a. Remove the drain plug.
b. Connect the fuel level gauge adapter "2"
and fuel level gauge "1" to the float cham-
ber.
Fuel level gauge adapter
90890-01470
Fuel level gauge adapter
YM-01470
Fuel level gauge
90890-01312
Fuel level gauge
YM-01312-A
c. Hold the fuel level gauge vertically next to
the float chamber mating surface.
d. Measure the fuel level with the fuel level
gauge.
TIP
Keep the carburetor and fuel level gauge verti-
cally when measuring the fuel level.
e. If the fuel level is not within specification,
inspect the valve seat and needle valve.
f. If either is worn, replace them both.
g. If both are fine, adjust the fuel level by
bending the float tab "b" on the float.
h. Recheck the fuel level.
7-10
CARBURETOR