Vic, I have an older a 1990 Kubota D 950 in a Jacobsen mower and it smokes when you start it for about 2 min, then clears up and can mow all day no problem.I was told by friend to get injectors tested,which I did at dealer and was told 1 was bad ,2 were fair.
I got 3 new injectors and installed and also cleaned fuel tank,new lines and filter.
It still does the same thing,any clues? Thanks George