Without a doubt the hyde mount along with the nose ring. The nose ring is what makes it work. With out it the motor mounts have broken even with alumn mounts. These lil power houses make some shake for certain. I just cant imagine what the fuse and wing joints in a basic arf would be like after a few races with this engine. It reminds me of my Harley with a 96" stroked shovel head in a small FX frame. It shoke everything loose.

If you are going to invest in that WM plane and that awesome YS engine spend the extra and ensure the life of the set up as well as the humans in that area. Get a soft mount with a nose ring (not just the mount).

On another note:
I just tached my new 115 with a 14x14 N on the ground (first run up) on heli (30%), and it hit 8900 with a good setting at 8500-8600. I cant wait to get this broke in and then turn up the nitro, it should hit 9500. I have switched to a 14x13N for now to keep the RPM's up so my cylinder walls will accpet the higher RPMS once it is broke in.

I hope to come up there for a race in the near future, as it sounds like you Sac guys really love racing like I do. Plus I can put faces to all these names.