I have a 1/4 acre lot in Fl and because I'm disabled I need a small riding mower, preferably with a Kohler engine(had a lot of bad luck with B&S) What do you recommend?

Take a look at Sears Craftsman mowers. Most with Kohler engines. I've had mine for ten years and never a problem. Lots of sizes to choose from. Dependable engines. Worth a look.

Don't limit yourself to sears though, ayp and mtd made... so if you like a mtd one... troy bilt, bolens, and all is under them. But if you go sears, they carry their own warranty, and they have the best... and as for kohler, very good engine, though what has given you trouble with briggs? Engines. Though I have to admit, all engine makers have a few bad apples.