Yamaha MIO Service Manual page 190

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CARBURETOR
9. Check:
• jet needle holder 1
• jet needle spring 2
• jet needle 3
• needle jet holder 4
• needle jet 5
• main jet 6
• pilot jet 7
• pilot screw 8
Bends/damage/wear → Replace.
Obstruction → Clean.
Blow out the jets with compressed air.
10.Check:
• piston valve movement
Insert the piston valve into the carburetor
body and move it up and down.
Tightness → Replace the piston valve.
11.Check:
• starter plunger 1
• starter plunger spring 2
Bends/cracks/damage → Replace.
12.Check:
• coasting enricher
• coasting enricher spring
• coasting enricher cover
Clog/cracks/damage → Replace.
13.Check:
• vacuum hose
• fuel hose
Cracks/damage/wear → Replace.
Obstruction → Clean.
Blow out the hoses with compressed air.
CARB