Hi Norm
I have a Ariens 21inch self propelled mower with a Kawasaki motor on it that I picked up from a Kerb collection the frame and the motor were fine but the gear box had to have every bearing replaced and I felt that they were all possibly a bit small for the job being asked of them and they were rather expensive. I did repair it though and still have it as after advertising it I could not sell it for what it cost me in parts. Its just a thought to consider.