Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 170Get this manual
CARBURETOR ASSEMBLING THE CARBURETOR
1Install: Needle valve Float Float pin 2
When setting the float into the carburetor body, hook the needle valve into the float and insert the needle valve seatTap float pin in the direction of arrow of carburetor body and with pin to installAfter installation,make sure that the float operates smoothly
2Measure: Float hight Out of specification