I have a 48" toro zmaster that has 490 hrs on it. I was cutting this morning and all of a sudden I could not cut thru hardly anything without bogging down. If I backed up, the engine regained its Rpm's but would decrease to near halt by the time I got back to grass. The guy over the phone said I may have thrown a rod or blew piston. Compression is 125 on outside and 15 inside so he says when he tested it. It has a 20hp kawasaki commercial engine. Not sure what to do. Is the mower still under warranty ? Have called my nearest toro dealer but can never get answer. The next closest is 60 miles.