Yamaha PW50W 2007 Service Manual page 146

CARBURETOR
2. Check:
9 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:
9 Float chamber body
Dirt → Clean.
4. Check:
9 Float
Damage → Replace.
5. Check:
9 Needle valve
9 Needle valve seat
Damage/obstruction/wear → Replace the
needle valve, needle valve seat and O-
ring as a set.
6. Check:
9 Throttle valve
Damage/scratches/wear → Replace.
6-5
CARB