I bought the bike recently and it needed a new speedo cable. I have replaced the speedo cable. The speedometer needle was on the right side of the little pin that holds the needle in place at 0-mph, so I took the housing apart and put the needle back where it belonged (to the left of the little pin). Figuring it was fixed...didn´t pay too much attention at first but later noticed that the needle moved back around (made a full circle) to the opposite side once again. Why is it doing this? I have tried moving it back three times now with no success as the needle keeps going back. Help!