Yamaha MIO Service Manual page 189

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2
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CARBURETOR
2. Check:
• fuel passages
Obstruction → Clean.
M MMM M MMM M M MMM
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 chamber rubber gasket
Cracks/damage/wear → Replace.
5. Check:
• float
Damage → Replace.
6. Check:
• needle valve 1
• needle valve seat 2
Damage/obstruction/wear → Replace the
needle valve and carburetor body as a set.
7. Check:
• piston valve 1
Damage/scratches/wear→ Replace.
• piston valve diaphragm 2
Cracks/tears → Replace.
8. Check:
• vacuum chamber cover
• piston valve spring
5 - 5
CARB
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L L LLL L L LLL L
M MMM M MMM
L LLL L LLL