Handling Note; Checking The Carburetor - Yamaha YZ125 2022 Owner's Service Manual

EAM30580

HANDLING NOTE

ECA27120
NOTICE
Do not loosen the screw (throttle position
sensor) "1" except when changing the throt-
tle position sensor due to failure because it
will cause a drop in engine performance.
1
EAM30573

CHECKING THE CARBURETOR

1. Check:
• Carburetor body
• Float chamber
• Jet housing
Cracks/damage  Replace.
2. Check:
• Fuel passages
Obstruction  Clean.
a. Wash the carburetor in a petroleum-based
solvent. Do not use any caustic carburetor
cleaning solution.
b. Blow out all of the passages and jets with
compressed air.
3. Check:
• Float chamber body
Dirt  Clean.
4. Check:
• Float chamber rubber gasket
Cracks/damage/wear  Replace.
5. Check:
• Float
Damage  Replace.
6. Check:
1 1 1
7. Check:
7-6
CARBURETOR
• Needle valve "1"
• Needle valve seat "2"
Damage/wear "a"  Replace.
Obstruction "b"  Clean.
a
1
• Jet needle "1"
• Main jet "2"
• Pilot jet "3"
• Power jet "4"
• Starter plunger
Bends/damage/wear  Replace.
Obstruction  Clean.
Blow out the jets with compressed air.
2
b
1