Why isn't this IEnumerator method being called?

I have the following script attached to a Sphere game object. When I run the game, the Sphere begins ascending and never stops. The truth value of itemBounceUp never changes. It seems that itemBounce() is never getting called, but I have no error messages and I can't figure out why. I thought it might be the for-loop but I tried pulling it out to see if I could get itemBounce() to run though even once and the same thing happened.

Thanks, Billy

 using UnityEngine;
 using System.Collections;
 
 public class BounceScript : MonoBehaviour {
     
     public float bouncespeed = 0.002f;
     public bool itemBounceUp = true;
 
     public void Start() {
         itemBounce();
     }
 
 
     public void Update () {
 
         if(itemBounceUp == true) {
 
             this.transform.position = this.transform.position + new Vector3(0, bouncespeed, 0);
                         
         }
         else if(itemBounceUp == false) {
             
             this.transform.position = this.transform.position + new Vector3(0, -bouncespeed, 0);
                 
         }
     }
 
 
     public IEnumerator itemBounce () {
         
         for(int i=1;i>0;i++) {
 
             yield return new WaitForSeconds(0.2f);
             itemBounceUp = false;
             
             yield return new WaitForSeconds(0.2f);
             itemBounceUp = true;
             
         }
     }
 }