So I recently bought a brand new spectrum SD-45 on ebay and I just received it today. It looks fantastic, but it doesn't seem to be running too well. When I run it in either direction it makes a clicking sound that sounds like plastic gears clicking. The speed of the clicking varies with the speed of the loco. Also, it doesn't seem to go quite as fast as it should. Any ideas? All I can think of is, maybe it needs some lubricant? What does a clicking sound usually imply?