Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 109Get this manual
Specifications Idle RPM (Out Of Gear) Idle RPM (In Forward Gear) Wide Open Throttle RPM (WOT) Range Main Jet Size Pilot Jet Idle Jet Float Height
825 25 RPM 775 25 RPM 5500-6000 #11 #50 #45 0.47-0.63 in(12.0-16.0 mm)