Mercury Mariner Outboards 2.2 / 2.5 / 3.0 Service Shop Manual, Page 32Get this manual
3Remove float hinge (a) and float pin (b) 5Remove throttle lever from bracket (a)Loosen retainer (b) several turns and then unscrew mixing chamber cover (c) Lift throttle valve-assembly from carburetor
4Model 2.2-3.0Remove inlet needle (a), main jet (b)screw in main nozzle (c) and float bowl gasket (d)Model 2.5Main jet (a) and drop in main nozzle (b) are as shown below