The 33S877-CC 19 HP Briggs & Stratton Engine Kit is a replacement for most Kohler Courage Single Cylinder Engines On Cub Cadet, Mtd. & TroyBilt Mowers.
www.flgparts.com
FWIW, I've never been able to look inside a 22hp predator, so i have no idea of the build quality, the smaller 212's, 308's and 420cc's engines do seem to do well for the price. i wouldn't expect 1,000 hours out of one.