Just an Inquiry on Teac A450 cassette deck

[skywaveTDR]

To keep things alive around here I thought I would ask if anyone had a 450 or A450 with the speed being too high by 60-70 Hz while using the smaller 60Hz pulley section and the correct and even a new 3uFd motor run caps and the motor was replaced by the one I sold him that was new Teac stock. I oiled it before it was sent out with AMSoil which I have used in the decks of all kinds for the last 3-4 years now. Never had I seen a deck go over speed with that oil. Torques are normal too the belt looks new.
If someone had resolved this problem I would like to know what their solution was. I already know what my solution came out to be but I am wondering if I missed something.
Also the voltage and wiring of the motor to the terminal strips are the same as a untouched from the factory unit I own.
Even theories will be welcome.

 

[skywaveTDR]

Just so those that might read this know, the unit was fixed and returned to the customer on speed. The only solution in this particular deck was a pulley modification that took a couple of hours to reduce the size by .2mm and then the wow and flutter was good and speed at 3007Hz. This unit due to it's age got a full electrolytic recaps and also required a record EQ modification. It turns out the old tape in 1974 when this came out were pretty horrible performance wise and so they put a ton of record EQ boost into it. The reduction allowed the bias to be turned down to reasonable amounts and the levels were correct. I think it was after doing this machine that I had to order 2000 10uFd 16V caps as my drawer of 500 got depleted. Not just from this machine but it seems that there are a lot of decks that use that value.