1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 73Get this manual
Specifications Idle RPM (Out of Gear) Idle RPM (In Forward Gear) Wide Open Throttle (W.O.T RPM Range Idle Mixture Screw Adjustment Float Level Main Jet Pilot Jet
800 50 RPM 700 50 RPM 5500-6000 2.5 (Turns Out) 0.39 0.02 in(10.0 0.5 mm) #112 #42