40 HP (4 stroke 4 cyl) 1.83:1 ratio 40 HP (EFI 4 stroke 1.83:1 ratio serial number T409000-up 45 Jet 3 cyl serial number D000750-up 50 HP 3 cyl 1991-95 serial number D000750-0G290584 50 HP (4 stroke 4 cyl) 1.83:1 ratio serial number T178500-up 50 HP (EFI 4 stroke) 1.83:1 ratio serial number T409000-up 55 HP 3 cyl serial number D000750-up 60 HP 3 cyl 1991-95 serial number D000750-0G290584 60 HP (4 stroke, std) serial number OT178500-up