It's not the 4n1 bucket that one has know about. It's the kl130 loader. U want the kl130B, which can be distinguished from the older one because it uses a round tubular crossmember that goes all the way thru the loader arms. The old style was rectangular and did not go thru the arms to the out side. Do a search for loader cracks in the kioti forum.
On the injector, that would have to be ur call. But if it fails it will cost u like $1500 to replace. Whatever tracto u buy be sure to add a lubricator to the fuel to extend the life of combustion components. Kioti might make it right no matter warranty, but they aren't obliged to.