Roger, it is a 1988. One possibility that I'll look into is that the brushes and brushplate were replaced, but the armature was not removed and cleaned. This would have left all the old deposits in the motor which might explain why the problem came back after only 2K miles.
Don, yes I would consider the K75S the most desireable of the old K bikes, and can't believe I actually sold it. Thanks for reminding me...
