Yamaha YZ125X1 Owner's Service Manual page 65

fuel level gauge.
Keep the carburetor and fuel level
gauge vertically when measuring the
fuel level.
e. If the fuel level is not within speci-
fication, inspect the valve seat
and needle valve.
f. If either is worn, replace them
both.
g. If both are fine, adjust the fuel lev-
el by bending the float tab "b" on
the float.
h. Recheck the fuel level.
CHECKING THE FLOAT
1. Inspect:
• Float "1"
→
Damage Replace.
CHECKING THE REED VALVE
1. Measure:
• Reed valve bending "a"
→
Out of specification
Reed valve bending limit:
0.2 mm (0.008 in)
2. Measure:
• Valve stopper height "a"
→
Out of specification
per/Replace valve stopper.
INSTALLING THE REED VALVE
1. Install:
• Reed valve "1"
• Stopper (reed valve) "2"
• Screw (reed valve) "3"
• Install the reed valve with the reed
valve bending as shown.
• Note the cut "a" in the lower corner
of the reed and stopper plate.
Tighten each screw gradually to
avoid warping.
2. Install:
• Reed valve assembly "1"
• Reed valve spacer "2"
Replace.
3. Install:
• Carburetor joint "1"
• Bolt (carburetor joint) "2"
Adjust stop-
CARBURETOR AND REED VALVE
Valve stopper height:
8.2–8.6 mm (0.323–
0.339 in)
Screw (reed valve):
1 Nm (0.1 m•kg, 0.7
ft•lb)
Bolt (carburetor joint):
10 Nm (1.0 m•kg, 7.2
ft•lb)
4-10
ASSEMBLING THE CARBURETOR
1. Install:
• Throttle stop screw "1"
• Locknut "2"
• Pilot air screw "3"
Note the following installation
points:
a. Screw in the pilot air screw until it
is lightly seated.
b. Back out it by the specified num-
ber of turns.
Pilot air screw:
2-1/4 turns out
2. Install:
• Starter plunger "1"
3. Install:
• Main jet holder "1"
• Main jet "2"
• Pilot jet "3"
• Valve seat "4"
• Screw (valve seat) "5"
4. Install:
• Needle valve "1"
• Float "2"
• Float pin "3"
• Screw (float pin) "4"
• Needle jet cover "5"