Handling Note; Checking The Carburetor - Yamaha YZ125X 2022 Owner's Service Manual

EAM30580

HANDLING NOTE

ECA27150
NOTICE
Do not disassemble the venturi block "1"
and main nozzle "2" because it will cause a
drop in carburetor performance.
EAM30573

CHECKING THE CARBURETOR

1. Check:
• Carburetor body
• Float chamber
• Jet housing
Cracks/damage  Replace.
2. Check:
• Air passage
Obstruction  Clean.
ECA27160
NOTICE
When cleaning the main air passage, do not
blow air at the filter side because it will clog
the passage with mud or sand.
TIP
• Use a petroleum based solvent for cleaning.
Blow out all passages and jets with com-
pressed air.
• Never use a wire.
• When cleaning the main air passage, blow air
through it while covering the nozzle with a
clean rag.
a. Main air passage
3. 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.
4. Check:
• Float chamber body
Dirt  Clean.
5. Check:
• Float chamber rubber gasket
Cracks/damage/wear  Replace.
6. Check:
• Float
Damage  Replace.
7. Check:
• Needle valve "1"
• Needle valve seat "2"
Damage/wear "a"  Replace.
Obstruction "b"  Clean.
a
7-5
CARBURETOR
2
b
1