Driving impression: Massey Ferguson 6497 tractor Although the arable tractor sector may have been relatively quiet in 2006, the one category still creating interest is the 180-220hp class – to the extent that some firms have a range dedicated to this size of machine. MF, in contrast, favours a different route, taking its 6400s from 67kW/90hp all the way up to 158kW/215hp