Custom Function not working ?

Can somebody tell me why the custom function (think that's the right term) the function newFunction part of my script doesn't work. I get no errors and the rest of the script works fine but it's like the newFunction is just completely ignored by the game ?

 #pragma strict 
        
 public var Boulder : GameObject;
 public var BoulderLimit : int; // the max amount of Boulders that can be spawned    
 public var BoulderCount : int; // the current amount of spawned Boulders    
 public var spawnBoulder : boolean; // if the Boulders are allowed to spawn
     
 function Update ()
 {
     if ( BoulderCount < BoulderLimit ) // check if the current spawn amount is below the limit  
     {
         SpawnBoulder (); // spawn the Boulder
     }
     else
     {
         spawnBoulder = false;
         Debug.Log ( "Spawn Limit Has Been Reached!" );
     }
 }
     
     
 function SpawnBoulder () // spawn the GameObject
 {
     Instantiate(Boulder, transform.position, transform.rotation);
     BoulderCount++; // add to the current amount of spawned Boulders
     Debug.Log ( "Spawned GameObject #" + BoulderCount );
     
     newFunction();  
 }
     
 function newFunction()
 {
     yield WaitForSeconds(8);
     BoulderCount--;
     Debug.Log ( "Boulder Count Reset!" );
 }

Any ideas guys ?