Yes, the 2145 Cub Cadet has a twin cylinder 14 horse Onan. I would not buy an Onan in a mower UNLESS it had a hydrostatic drive. This way the engine runs at constant speed. The Onan's live forever in a constant speed application such as hydrostatic drive, a generator, or welder.
And yes, I did want a diesel mower really bad, but not bad enough to spend almost twice as much money.
Have a great day,