Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 168Get this manual
CARBURETOR DISASSEMBLING THE CARBURETOR
Remove: Float pin Float Needle valve
Tap float pin in the direction of arrow of carburetor body and in the reverse direction with pin to remove
CHECKING THE CARBURETOR CAUTION:
Do not use steel-wire for cleaning the jetsThis may enlarge the jet diameters and seriously affect performance1Check: Carburetor body Cracksdamage ReplaceContamination Clean2Check: Needle valve Pilot screw Grooved wear 3Check: Main nozzle Main jet Pilot jet Contamination 4Check: Float Cracksdamage