IsKinematic resets my Vector3

I'm trying to stop a object and then start it again with the exact same velocity and direction. I use .isKinematic for stopping and starting the object.

And I tried storing the velocity in a Vector3 (vel), but as soon as BulletRigidbody.isKinematic = true is applied, my vector becomes 0,0,0. I can see the velocity getting stored until IsKinematic is applied.

Anybody knows whats wrong?

 public class enemy_projectile : MonoBehaviour {
 
 
     public Vector3 vel;
 
     public bool beenShoot = false;
     public bool activateShoot = false;
     public bool StoreVel = false;
 
 
     private Rigidbody BulletRigidbody;
 
 
 
     // Use this for initialization
     void Start () {
         BulletRigidbody = GetComponent<Rigidbody>();
     }
 
     // Update is called once per frame
     void FixedUpdate()
     {
         // If it has been shot.
         if (beenShoot == true)
         {
             StartCoroutine(BulletSequence());
         }
 
 
         if (activateShoot == true)
         {
             // Activates it again and apply the old velocity.
             BulletRigidbody.isKinematic = false;
             BulletRigidbody.velocity = vel;
         }
 
     }
 
 
     IEnumerator BulletSequence()
     {
         // Takes the velocity of the bullet into a vector3.
         vel = BulletRigidbody.velocity;
 
         // Waits 1s.
         yield return new WaitForSeconds(1);
         //Disables it.
         BulletRigidbody.isKinematic = true;
 
         //Wait 2s.
         yield return new WaitForSeconds(2);
         //Activate it again.
         activateShoot = true;
         beenShoot = false;
     }
 
 }