It is unlikely that a motor would cause speed problems, it could be the DC power supply that is causing these problems.
Changing the engine with the risk of solving nothing and throwing away a lot of money is the worst option.
In old Gyrodec like mine the speed problems were usually attributable to a small ceramic capacitor located in the motor but easily accessible and replaceable but they were rare cases and relegated to Papst motors operating in AC... for this reason I would look more at the power supply than to the motor in the new DC
Please Help. J. A. Michell Gyro SE - Speed Issue
Back in 2003 I purchased a used Michell Gyro SE from a fellow member on Audiogon. Excellent table, excellent design....
About a month ago the speed of the platter increased; way faster than 33 1/3.
I've sent multiple emails directly to Michell in England, but alas, no reply.
I have not tried to call them directly, and may try to do so.
Does anyone know of anybody or any company in North America that can provide service for J.A. Michaell turntable?
Thank you in advance for your help!