Not necessarily bad. Most well run Nova based motors will have a bit of pinch when cold but little or none when hot and still run strong. I have had some Sirio based motors with no pinch whatsoever that still screamed. I also had a plus 35 with pinch from hell and could never get it to free up. Still ran good though.

Usually motors will get difficult to tune and not want to idle well when they finally wear out completely. If it still holds a tune and runs strong, keep running it.