Yamaha GT 2000 with 40 pound copper platter.

So you’re saying that vintage knob is wrong, because all I am doing and ever have done is to quote what is available on vintage knob?. I do realize that vintage knob is often incorrect. Which is why I prefaced my remark by stating the case “if you believe vintage knob”. I promise you I will never write another word about the GT 2000 turntable, if you will enlighten me further; is it your position that the GT2000 only came with one standard motor and was never available with the X motor? Or do you claim that the 2000 and the X used the same motor? I’ll take your response as gospel truth; I promise. 

If you believe Vintage Knob, the GT2000 could be purchased with an optional high torque motor, the same motor that was standard on the X version. If I was going to use a 40-lb platter, I’d want that bigger motor.

Less rotational inertia, which is the main point of the high mass. But sure, it would “work”. Lower inertia would make it easier in the motor.

And I keep reversing the alphanumeric designation.  Toyota made a sports car in the 60s that they called the "2000GT". It's now very valuable to collectors. The Yamaha tt is "GT2000" or GT2000X.  Sorry for any confusion.

As I mentioned on this forum once before, if you visit the audiophile salons in Tokyo, the 2000 GT is one of the most common of the high end turntables that you will find for sale, in secondhand condition of course. Conversely, I have never seen a GT 2000X for sale. They generally command more than twice the price of a nice 2000 GT, if you can find one at all. There was an optional gunmetal platter for these tables that weighed 18 kg, which is even more than the platter on the SP 10 Mark III. So I have no doubt that the 2000 can handle a 40 pound platter without much trouble for the motor.