To answer my own question, this site claims to sell one. No idea if true at this stage but maybe useful to someone.
https://www.turntableneedles.com/ya...0400-square-drive-belt-sbo6.6-yamaha-cb650400
Yeah that's what I plan to do now. Seem to be 6.6 inches in diameter.
Is there an easy way to disconnect the belt and see if it is causing the vibration? I know, too many times, manufacturers build an entire machine around the belt. With a problem such as this, you can put your finger on say the transformer or motor and observe whether or not the hum changes or disappears. Even using the eraser end of a pencil will do this. At least that way, there would be an indication as to where the noise was being produced
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Me too. But the seller is from the US, so... 🙂
That's an interesting thought about the belt. I'll have to disassemble it further to check that.
Pressing on the transformer, motor, or case does not seem to alter the sound of the hum by much, so yeah, not sure what is causing it all really.