Hustler Raptor Engine

I am looking to buy a zero radius lawnmower. My wife has come across a used Hustler Raptor 48" with 60 hours on it. It has a 19 hp S31Q677 Briggs and Stratton Engine. I am curious about the engine. I do not see anything to indicate that Hustler ever put Briggs and Stratton engines on their mowers and the 48" all seem to have 22-23 HP motors. Should I be concerned about the engine and mower?

That's weird. I did check on the website and for the Hustler Raptor it states that it is a Kawi or color engine. Might be worth asking. Maybe he blew up the engine or something. How does the rest of the unit look?