Self made FPS Controller not looking up or down

Hello fellow developers,

I'm trying to make my own FPS controller, the problem I'm having now is that it will not look up or down, I tried commenting up the clamping, or adding another transform.Rotation for that but It'll go all 360 degrees. Help would be greatly appreciated.

 using UnityEngine;
 using System.Collections;
 
 public class PlayerController : MonoBehaviour {
 
     public float Speed;
     public float MouseSensitivity;
     float RotationY = 0;
 
     CharacterController CharController;
 
     // Use this for initialization
     void Start ()
     {
         CharController = GetComponent<CharacterController>();
     }
     
     // Update is called once per frame
     void Update ()
     {
         //ROTATION
         float RotationX = Input.GetAxis("Mouse X") * MouseSensitivity;
         transform.Rotate(0, RotationX, 0); // looking right and left
 
         Debug.Log(RotationY);
         RotationY = Input.GetAxis("Mouse Y") * MouseSensitivity;
         RotationY = Mathf.Clamp(RotationY, -60f, 60f);
         Camera.main.transform.localRotation = Quaternion.Euler(RotationY, 0, 0); // for looking up and down
 
         //MOVEMENT
         float VerMovement = Input.GetAxis("Vertical");
         float HorMovement = Input.GetAxis("Horizontal");
 
         Vector3 Movement = new Vector3(HorMovement, 0.0f, VerMovement);
 
         Movement = transform.rotation * Movement; //resets the coridenates when rotating
 
         CharController.SimpleMove(Movement * Speed);
     }
 }