Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 86Get this manual
10lf necessaryremove screws which secure throttle shutter plate to throttle shaftthen pull throttleshaft out of carburetor Carburetor Cleaning and Inspection
, Place carburetor bodyfuel bowl and metal parts in carburetor clean ing solution for short period of time to remove all di rt, gum and varnish which may have acc umul ated
o.CAUTION
Do not place floats, Inlet needle orany rubber or plastic pa rts Into carburetor cleaner2After soaking carburetor parts, rinse thoroughly with water, then solventBlow parts dry wit com pressed ai rBe su re to blow th ru all passagesorifices and nozzles3Check for float deterioration (saturation) 4Examine inlet needle and seat for wearIf wornreplace with new inlet needle and seat assembly24077