You need to know which pistons are in the tractor if you are going to change over to the later injectors... if you still have the R pistons with the precombustion chamber in them.. then you need to stick with the spray angle of the R injectors... the injector hole in the head needs to be bigger if you are going to the later injectors.. its an easy task.. but its been too long since doing one to remember how much bigger you have to go.. Its not much.. but has to be done...
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