Yamaha YZ250 2022, Owner'S Service Manual

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CARBURETOR
7-7
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 stopper height “b”
Out of specification

Replace.
EAM30577
INSTALLING THE REED VALVE
1. Install:
• Reed valve “1”
•
Reed valve stopper “2”
• Reed valve screw “3”
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.
Valve bending limit
0.2 mm (0.01 in)
2
3
4
Valve stopper height
10.3–10.7 mm (0.41–0.42 in)
Reed valve screw
1.0 N·m (0.10 kgf·m, 0.73 lb·ft)
b b
T
R
.
.