Help with player variables (prefab/network)

Hi guys, i'm doing a multiplayer game and i have some problems when i try to access to the other player variables. I can't read anything of this variables cause their returns me 0 always.

This is caused because i have to configure it with [clientrpc] or network.rpc? How i can get the varibles of the other player? I don't understand it, someone can explain me how i should do it?

There is my script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.Networking;
 
 
 public class MovementMulti : NetworkBehaviour {
 
     private float aumentoA = 0.1f;
     [Header("Movement Variables")]
     [SerializeField]
     public float vX;
     [SerializeField]
     public float vZ;
     [Header("Camera Position Variables")]
     [SerializeField]
     float cameraHeight = 15f;
     Rigidbody rg;
     public int id;
     bool bounced = true;
     public float rX;
     public float rZ;
     public float potencia;
     
 
     Transform mainCamera;
     Vector3 cameraOffset;
     // Use this for initialization
     void Start()
     {
         if (isLocalPlayer) {
             cameraOffset = new Vector3(0f, cameraHeight, 0f);
             mainCamera = Camera.main.transform;
             MoveCamera();
             rg = GetComponent<Rigidbody>();
             id = Random.Range(0, 1000000000);
         }
 
     }
 
     void MoveCamera() {
         mainCamera.position = transform.position;
         mainCamera.rotation = transform.rotation;
         mainCamera.Translate(cameraOffset);
         mainCamera.LookAt(transform);
     }
     
     
     private void OnCollisionEnter(Collision other)
     {
         if (other.gameObject.tag == "Player")
         {
             Debug.Log(this.gameObject.name);
             Debug.Log(other.gameObject.name);
             if (id > other.gameObject.GetComponent<MovementMulti>().id && bounced) // <--IT RETURNS 0
             {
                 bounced = false;
                 float aux = vZ;
                 float aux2 = vX;
                 vZ = other.gameObject.GetComponent<MovementMulti>().vZ;//IT RETURNS 0
                 vX = other.gameObject.GetComponent<MovementMulti>().vX; //IT RETURNS 0
                 other.gameObject.GetComponent<MovementMulti>().vZ = aux;
                 other.gameObject.GetComponent<MovementMulti>().vX = aux2;
             }
         }
     }
 
     private void OnCollisionExit(Collision other) {
         bounced = true;
     }
 
     // Update is called once per frame
     void Update()
     {
         float x = Input.acceleration.x; //x negativa izquierda
         float y = Input.acceleration.y; //y negativa abajo
 
         float aumentoX = aumentoA * x;
         float aumentoY = aumentoA * y;
 
         if (x > 0)
         {
             vX += aumentoX;
         }
         else if (x < 0)
         {
             vX += aumentoX;
         }
 
         if (y > 0)
         {        // Up
             vZ += aumentoY;
         }
         else if (y < 0)
         {        // Down
             vZ += aumentoY;
         }
 
         //Dependiendo de los valores del eje se moverá de una forma u o de otra.
         transform.Translate(Vector3.right * vX * Time.deltaTime);
         transform.Translate(Vector3.forward * vZ * Time.deltaTime);
         MoveCamera();
     }
 }