Both clutch bell gears should touch both spur gears. Just move motor into place and slightly tighten down screws. Try to turn the spur with your fingers. Everything shoud move freely and not bind but you dont want it too loose. If you hold the clutch bell with one finger and move teh spur back and forth you should have a very little bit of play between the bell and spurs. If everything is as I described you can tighten the screwes down tight.