Why Does My Nottingham Motor Seem To Run Fast?

You absolutely have to give it a hefty push start to get it spinning way above the speed you really need it at.
Then it gradually slows to whatever speed you are set for 33 or 45.
I never had a problem with it then slowing down past its setspeed as long as I followed this regime.

Ned
Hollywood Sound will also be able to sell you the correct recommended Nottingham oil for the bearing.
I used cotton buds to clean all the old oil put of mine before putting fresh oil in it.

It is definitely a most rewarding deck, only sold mine as I moved to a fully restored Garrard 401 idler drive.

As Lewm stated
Notts platters/motors are relatively high mass/low torque affairs.
In fact the Notts motor is designed to be left turned on at all times and it just sits there until you give it a push start which does require a healthy spin .
And then to stop you actually catch the edge of the platter with your hand to slow it down and stop it.
Sounds archaic but it works fine and they usually hold good speed regulation and even better with a Walker speed controller.
I bought Lewm old Walker from him and I was very impressed with the difference it made.
Something to consider if you plan on keeping the Notts. 

Glad you got it resolved.
Yes if riding out of the groove it's like using the wrong diameter pulley.

I believe Hollywood Sound in Florida is still the official dealer for Nottingham.
You should be able to order the correct belt from them.

Good luck!

Previous Spacedeck owner here.
Never heard of one running that fast.
Sure it has the correct pulley on the motor?
Very odd as mine was maybe 33.4.
I then added a Walker speed controller which is very popular mod in Notts decks and was able to tweak it to exact 33.33/4.
To be running at 36 something has to be seriously out of whack.