I don't know that there is anything "wrong" with them, other than the fact that they wear out, and many owners don't understand the consequences that worn mounts have on the tractor as a whole.
However my questions were "What would be the difference between putting solid motor mounts in a Quiet Line, and a stock Narrow or Wide Frame, with the motor bolted directly to the frame?" and "So how bad could the vibration be with solid mounts???"
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