John,
My name is Mike McIntosh in Tallahassee Florida and I spoke with you several years ago regarding my 550 and I finally found someone to rebuild the motor as I new it would need rebuilding. 
I had your phone number on my old phone but I can't find it since I got a new phone. My cell number is still (850) 212-7966.
We got the motor out and tore down and ready to send to the machine shop and I would like to talk with you about properly rebuilding if you don't mind.
I remember there being some critical points that need to be addressed.
Thank you for your previous help with my tractor and could sure use some more advise from you if you don't mind.
Thank You,
Mike McIntosh