I have a snapper push lawn mower serial no. 06061785 and model no. 21357B. I was told that it is hard to find a briggs and straton motor for it. Would like to have a 5 hp. Any help on model no. of motor that can fit my base
Since it's a 3.5 - any cheap mower from Wal Mart with a Briggs should be able to give you a donor engine.
Doing it that way is way cheaper than just buying a brand new engine. A new engine alone will cost you twice what a new mower with that same engine does from Wally World.
I've found cheap old snappers on craigslist that have engines that will fit my deck and just swapped them. I would try looking there for a mower that is similar to yours and just take the motor off of it and put it on your deck.