How do you remove bottom end on 91 mercury classic fifty?

To remove the bottom end of a 1991 Mercury Classic 50 outboard motor, start by disconnecting the battery and draining the gear oil. Then, remove the lower unit by loosening the bolts that secure it, typically found on the anti-cavitation plate and the side of the unit. Carefully lower the lower unit straight down to avoid damaging the shift shaft. Finally, you may need to remove additional components, like the propeller and exhaust housing, depending on your repair needs.