If you have a Walker . How many hours do you have? Do you put on so many hours than get rid of it it before you sink to much $$$ into repairs. I just have the one Walker so I'm really faithful when it comes to the maintenance. I figure between 1700hrs and 2000hrs its time to retire the machine. Down time sucks My first Walker I bought used at 1200hrs and at 2100hrs the engine died. Its always good to have a reliable piece of equipment.