I have used both the OEM mounts and the chassis mounts...the OEM mounts actually absorb the vibration. I put them in a 1650, and it was nearly as smooth as the twin cylinder engines in my later cubs at full throttle. The sway bar mounts don't so well. They are a LOT stiffer than the OEM mounts, and they don't damp out the vibrations at full throttle because they are not designed to.
The difference may be less noticeable on a smaller engine, but on a 1450 or 1650 you will definitely notice a difference. Solid-mounting the engine on a 10 or 12 hp tractor will have no less vibration than any tractor in a previous series with those engines; it probably vibrates more in the QL with solid mounts because of the less rigid mounting setup compared to bolting the engine straight to the frame, but the K241 and K301 do not vibrate as bad to begin with. And there would still be an improvement with the iso-mounts. All of the QL tractors I have had with good engine mounts were much quieter at full throttle than half throttle because the mounts were doing their job, and all the sheetmetal stopped rattling.
It's funny how nearly everyone that bashes the OEM mounts has never actually used them- they went from totally worn out iso-mounts to either solid mounts or sway bar bushings, and claim what a great improvement they are. Well, yeah, just about ANYTHING is an improvement over 4 squashed mounts and one or two engine mount bolts missing.
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