Vibration is the issue since the engine mount is 1/4 lite ply built into the fuse side. I had an Eaglet come apart with an .26. For my .56 4-stroke on the Eagle, I reinforced the ply doublers with glass, then glassed the 1/4 ply as well. I then laid two strips of 1/8 neoprene under the engine to act as a dampener.

Scott