1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 88Get this manual
Inspection
Carburetor Assembly
CAUTION
1Install idle mixture screwLightly seat idle mixture screw and then back out 2.5 turns53674
Do not use steel wire for cleaning the jets as this may enlarge the jet diameters and seriously affect performanceUse petroleum based solvent for cleaning and blowout all passages with compressed air1Inspect carburetor body, replace if cracked or damaged53671
aIdle Mixture Spring
2Inspect float, replace if cracked or damaged53673