Carburetor; Checking The Carburetor - Yamaha XG250 Service Manual

EAS26760

CHECKING THE CARBURETOR

1. Check:
Carburetor body
●
Float chamber
●
Cracks/damage → Replace.
2. Check:
Fuel passages
●
Obstruction → Clean.
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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.
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3. Check:
Float chamber body
●
Dirt → Clean.
4. Check:
Float
●
Damage → Replace.
5. Check:
Needle valve seat "1"
●
Needle valve "2"
●
Damage/obstruction/wear → Replace the
needle valve, needle valve seat and O-ring
as a set.
6. Check:
O-ring "3"
●
Damage/wear → Replace the needle valve,
needle valve seat and O-ring as a set.
7. Check:
Piston valve "1"
●
Damage/scratches/wear → Replace.
Piston valve diaphragm "2"
●
Cracks/tears → Replace.
8. Check:
Cover "1"
●
Diaphram spring "2"
●
Cracks/damage → Replace.
1
9. Check:
Pilot screw set "1"
●
Pilot jet "2"
●
Main jet "3"
●
Main nozzle "4"
●
Bends/damage/wear → Replace.
Obstruction → Clean.
Blow out the jets with compressed air.
6-5

CARBURETOR

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