Riding a motorbike

Scripting is another world to me, and I'm fairly new to Unity. I've made a motorbike, and with the help of someone else from the forums I now have a script that allows me to mount my bike model. I essentially want to walk around as the bike, so when I walk up to it and click on the bike, the bike becomes part of the First Person Controller. I'm not bothered about bike physics for this I literally just want to be able to walk around as the bike. Is there something in the script that stops me doing this? All I can do so far is stand with the bike and look around 360 degrees?

The bike is it's own object in the hierarchy and every object in it has a mesh collider on it.

Here's the script as of now:

 var rayDistance : int = 5; //how far will the raycast go?
  var cam : Transform; //assign this to your camera.
  var yOffset : float = 0.5; //how high above the bike should the character be when he sits on it?
 
  function Update()
  {
  var hit : RaycastHit; //stores info about what the ray hits
  if(Physics.Raycast(cam.position, cam.forward, hit, rayDistance) && Input.GetMouseButtonDown(0))    
  /*looks for objects in front of us and checks if we click*/
  {
  if(hit.transform.root.name == "Bike") //if we did click we will check if the ray hit the bike. 
  {
  var bike : Transform = hit.transform.root; //stores the bike in a variable
 
  for(var bikePart in bike)
  bikePart.collider.enabled = false;
 
  transform.position = Vector3(bike.position.x, bike.position.y + yOffset, bike.position.z); /*moves character. a little bit  above the bike. The higher the yOffset the higher above the bike he sits.*/
  bike.rotation.y = transform.rotation.y; //rotates the bike so we're not riding sideways.
  bike.parent = transform; //parents the character to the bike so it will follow us
  }
  }
  }

Thanks

Bike Image