Yamaha Outboards 3P Service Manual, Page 33Get this manual
IFUELI1i I_C_A_R_BU_R_E_TO_R E32001-1 '
INSPECTION Carburetor body
1) Inspect the carburetor body for cracks or clogging of the passagesNeedle valve
1) Inspect the needle valve for free movement and wear, and replace if requiredPilot screw
1) Inspect the needle valve for wear, and replace if requiredFloat
1) Visually inspect the float for damage or cracks, and replace if required2) Measure the float heightIf it is higher or lower than the specified float height, recheck the valve seat and needle-valveSpecified float height: 14 mm (0.55 in)