Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 98Get this manual
JET LOCATION FOR EACH CYLINDER
Cylinder #2
Cylinder #1
Cyli nder #4
Cylinder
Cylinder #6
Cylinder #5
Carburetor jets and adjustment screw installed in the starboard side of the carburetor supply fuel to the port cylinder, jets and adjustment screw installed in the port side supply fuel to the starboard cylinderNOTE: The idle jet and back draft jet affect both cylinders