Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 116Get this manual
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CARBURETOR
9 Carburetor body
CracksDamage ReplaceContamination Clean2 Inspect: 9 Main jet 9 Pilot jet 9 Main nozzle Contamination Clean3 Inspect: 9 Needle valve 9 Pilot screw (Excep