Excellent buy Johnathan, Those old PFM/United models are built like a tank. Actualy with some proper turn up, that original motor and drive will operate as quiet as a modern can motor. The gear box and ratio are good on these models, normaly the rubber tube that connects the motor to the box is hard and brittle, both of which cause noise, as does dried and congelled grease. clean out the old grease from the gear box, hit all the bearings with a light weight oil, clean the communtator on the motor and put a new piece of rubber tubing in there. You will have to adjust the tubing so its not putting thrust loads on the gear box or motor bearings, once you find the sweet spot, she will run smooth and quiet. I have done many of these engines and have had guys think I have put a can motor in them, when it was just the old Pittman. If the old motor is done for, a simple can motor like a Sagami, Cannon or Mashma is all you need, mount motor with bathtub caulk and connect it with a fresh rubber tube. I usualy strap the motor to the frame with electrical tape till the caulk cures overnight. Then you can remove the tape and test run/adjust the rubber tube. The gear box floats per sea on these and they are best left this way, allowing the rubber tube to keep it in place. Enjoy your new model!!! Mike