Do all 9600's that are year model '92 and newer have 260HP engines or is it just the corn/bean models? What are the differences between small grain and corn/bean models? When looking at a '93 or '94 year model with around 2500 sep. hrs and 3500 eng. hrs., is there anything I need to pay special attention to? And after how many engine hrs. would you need to rebuild the engine?