The Minecraft DBC Mod allows you to get a feel for Dragon Ball Z the Minecraft way. You are able to explore the world and you can find various characters such as King Kai and King Yama. That being said if you are looking to train in the game running the perilous Snake Way every time can be a giant waste of time. Especially if you click the button to remove your Ki attacks. Which means to learn the Kaioken you have to run snake way all over again.
I have found King Kai and below are the coordinates that you could use to teleport to him. These coordinates will place you right next to him and you will be able to train for both the Spirit Bomb and Kaioken.