Instantiated Particles reverse direction. Why?

I created a Particle System and then made a prefab with the particles spraying to the left, but when I instantiate them in the scene the particles spray the opposite way, directly to the right. Does anybody know why this is happening and how I can correct it? Thanx

#pragma strict
var ParticleSystemPrefab : Transform;
function Start() {
    
     Instantiate(ParticleSystemPrefab, GameObject.Find("Tum1").transform.position, Quaternion.identity);      

}`

I’ve tried taking out “Quaternion.identity” and replaced it with transform.rotation but this didn’t do anything. Any suggestions?

#pragma strict
var ParticleSystemPrefab : Transform;
function Start() {

 instant = Instantiate(ParticleSystemPrefab, GameObject.Find("Tum1").transform.position, Quaternion.identity);      
 instant.transform.rotation.x = 90; //Just add the perfect rotation here
}