Installing The Reed Valve; Assembling The Carburetor - Yamaha YZ125X 2021 Owner's Service Manual

• Valve stopper height "b"
Out of specification  Replace.
Valve stopper height
8.2–8.6 mm (0.32–0.34 in)
b
EAM30577

INSTALLING THE REED VALVE

1. Install:
• Reed valve "1"
• Reed valve stopper "2"
• Reed valve screw "3"
Reed valve screw
1.0 N·m (0.10 kgf·m, 0.73 lb·ft)
TIP
• Install the reed valve with the reed valve bend-
ing as shown.
• Note the cut "a" in the lower corner of the reed
valve and stopper.
• Tighten each screw gradually to avoid warping.
b
2. Install:
• Reed valve assembly "1"
• Reed valve spacer "2"
3. Install:
• Carburetor joint "1"
• Carburetor joint bolt "2"
Carburetor joint bolt
10 N·m (1.0 kgf·m, 7.4 lb·ft)
EAM30576

ASSEMBLING THE CARBURETOR

1. Install:
• Throttle stop screw "1"
• Locknut "2"
• Pilot air screw "3"
a. Turn in the pilot air screw until it is lightly
seated.
b. Turn out the pilot air screw by the number
of turns recorded before removing.
Air screw turns out
2-1/4
7-7
CARBURETOR