Change the direction in which a character spawns?

Im making a mario kart-ish racing game and i got the characters to spawn just fine, except that they spawn in the wrong direction. So when they spawn i need to turn around for the lap system to work, and the stage is designed to work when driving a specific direction.
Any know how i can fix this?
The code is use is this

using UnityEngine;
using System.Collections;

public class CharacterSpawner : MonoBehaviour 
	public Transform player1Spawner;
	public GameObject playerPrefab;
	public Transform player1Camera;
	// Use this for initialization
	void Start () 
		GameObject go=(GameObject)GameObject.Instantiate(playerPrefab,player1Spawner.position,player1Spawner.rotation);
		GameObject go2=(GameObject)GameObject.Instantiate(Resources.Load(PlayerPrefs.GetString("playername")),player1Spawner.position,player1Spawner.rotation);
	// Update is called once per frame
	void Update () 

Use the desired direction instead of player1Spawner.rotation