Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 91Get this manual
CARBURETOR
5Remove the main jet6Remove the main nozzleThe nozzle should drop outIf not, carefully push the nozzle out as shown
aMain JetMain Nozzle
Inspection
1Clean the main jet, main nozzle, pilot jet and pilot screw thoroughly with compressed air before installation