Checking The Reed Valve; Installing The Reed Valve - Yamaha YZ250 2022 Owner's Service Manual

2
8. Check:
• Free movement
Stick  Repair or replace.
TIP
Insert the throttle valve "2" into the carburetor
body while pulling up the lever "1", and check for
free movement.
9. Check:
• Hose joint
Cracks/damage  Replace.
10.Check:
• Carburetor breather hose
• Fuel hose
Cracks/damage/wear  Replace.
Obstruction  Clean.
Blow out the hoses with compressed air.
EAM30574

CHECKING THE REED VALVE

1. Measure:
• Reed valve bending "a"
Out of limit  Replace.
Valve bending limit
0.2 mm (0.01 in)
3
4
• Valve stopper height "b"
Out of specification  Replace.
Valve stopper height
10.3–10.7 mm (0.41–0.42 in)
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.
7-7
CARBURETOR
b b