I recently dropped the needle clip 1 notch. Then when everything was assembled i tested the trottle to make sure everything was woking right. and it wasnt. I tried to fix it by making sure the nothch on the spring went into the slop for the clip holder, everything is in the right spot, and i did what i usually did when i change the needle position. So the problem is like i said when i open the throttle and then let it come back on its own it returns, but VERY slowly. It is a mikuni carburator.