hang on!, i think the nsr only has a square at one end. The end that goes into the drive should have a little bar with a slot in it. The slot locates and thats what turns it. Are you sure the inner part of the cable isnt in backwards? that would do it (you can pull it out and turn it around see). The square end shoudl go into the speedo not the drive.
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If I have to take the carbs off once more...