Originally Posted by Propworn

Soft mount, hard mount the debate goes on uselessly of course. The engine doesn’t care but everyone seems to think it does. Horse pucky. Take a look at engines today some are soft mounted many are hard mounted. Hard mounted dirt bikes produce a ton more internal forces than any airframe could. Your lawnmower shakes, vibrates and bounces over uneven ground without a problem. Soft mount every car, truck etc is soft mounted. Soft mounting simply reduced engine oscillations and noise to the frame/passengers in a vehicle mostly for comfort.

Some RC exhaust manufacturers will not warrantee their exhaust systems with a soft mount.

My earliest bike was a 1956 Arial Red Hunter it and most bikes I have owned since have all had the engine hard mounted. Norton came along with their feather bed frame (soft mount) it reduced some of the engine oscillations to the rider they claimed better comfort. It had nothing to do with engine durability or longevity. I have never heard any manufacturer claim as much.

In my opinion balancing your prop/spinner is more important than whether your engine is hard or soft mounted.

Dennis Pratt