2 Cub cadet lawn mowers hydrostatic

One is a 1320 and has a 12.5hp engine on it, it ran when parked about 2 years ago everything worked.

Other is a 1420 and has a 16.5hp engine ran last year, however something is out in the main drive. It skips when trying to drive.

Not enough time to work on either and got to many the way it is. Make one good one out of the two or fix both.