Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 9Get this manual
Fuel System MERCURYMARINER MODELS: 225 Carburetor Three Two Barrel Center BowlFixed Jet and Adjustable Idle Mixture Screw
Crank Position Sensor Air Gap0.040 in .020 in(1 .02mm 0.5 1mm)
Charging System
Type Belt Driven, Wound Field Alternator with Built-in Solid State Regulator Output 30 Amps 750 RPM 60 Amps 2000 RPM Brush Length Std Exposed Length0.4 13 in(1 0.5mm) Min Exposed Length: 0.059 in (1.5 mm)
Float Level Float is Level with Edge of Fuel Bowl when held upside-down Idle Mixture Screws ClockwiseLean CounterclockwiseRich NOTE: Idle mixture screws must be turned the same amount and in the same direction from the straight up factory set position for engine to operate efficientlyIdle RPM (in Forward Gear): Model 225 550-625 RPM
Recommended Gasoline Automotive Regu lar or Unleaded with Minimum Octane Rating of 87 (Research Octane No90)
Starter Motor
Type Permanent Magnet with Over-riding Clutch
Draw No Load: 25 Amperes Full Load: 165 Amperes Brush Length Minimum Length: 0.25 in(S.4mm)