1983 Yamaha 30EN Outboards Service Manual, Page 47Get this manual
Assembly
AJways use new gaskets as preventive measure against fuel leakage
1Screw in the main nozzle until stops, and screw in the main jet until tight
When screwing in the main nozzle, use care not to damage the threads on the mixing chamber1Gasket
3Needle valve 5Hinge pin
2 Valve seat 4Float
Float height adjustment Hold the carburetor upside down, and incline it about 60 as shownWhile holding the float in this position, measure the float hieght on the opposite side to the hingeIf the height is incorrect, adjust it by bending the hinged tang