Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 89Get this manual
9Place fuel bowl gasket onto carbu retor body 12Install idle jet and idle jet plug with gasket
aFuel Bowl Gasket
10Install main jet plug with main jet and gasket
a- Idle Jet Idle Jet PlugGasket
13.1f removedinstall shutter plate onto flat of throttle shaft with screws and lock washers as shown