thank you all for trouble shooting with we by the way

 

If you look at the stopper arm, it should have a spring that pulls it against the cam. Is the spring there and is the wheel on the arm in good shape? Can you manually change gears and observe the cam/stopper in action?

The spring on the arm and the arm are popular items to upgrade. The upgrade is a better bearing stopper arm and a heavier spring to keep the arm from bouncing out during hard shifts. could be that your spring is cracked or weakened.

How many miles have you put on the bike?

 

that is exactly what i was thinking. thank you so much. you hit the nail on the head. worked like a charm. thanks again