Yamaha FZR400 1988-1989 Service Manual page 237

CARBURETOR
2. Adjust:
Fuel level
??
Fuel level adjustment steps:
*Remove the carburetor assembly.
Refer to "REMOVAL" section.
*Remove the float, valve seat and the needle
valve.
??
inspect the valve seat and the needle valve.
If either is worn, replace as a set.
*If both are fine, adjust the float height by
bending the float tang 0.
@Recheck the fuel level.
6 - 1 1