My 1650 with fresh rebuild and new ISO mounts, vibrates so bad at mid throttle you would think your teeth would fall out. But idle and full throttle are good.
I never torqued my nuts, (sounds like a personal problem) for the ISO mounts, just put on new lock nuts and I think turned them down about 1 1/2 threads.
Someone correct me if that's wrong please. But I have read also, it's what it is, they vibrate.
I know you were looking for a comparison between the two, sorry, no help there.
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