Don't worry, my props are balanced and my low-end is leaned out perfectly (1/8th turn richer than a failure to transition).

My SA100 is in a Mojo 60 profile 3D (which is light at 5.5lbs) so the torque pulses are *really* noticeable.

Strangely enough, my SA82 is in a *really* flimsy profile but it hardly vibrates at all.

Quite a few people I've spoken to say that their 100s also really shake -- but some others don't. Likewise, some folks have 82s that are bone-crushers -- but mine's not.

I suspect that some Saitos are just more inclined to vibrate more than others -- end of story.

However, one thing's for sure, the vibration level of a very light and powerful 4-stroke will always be higher than that of a 2-stroke of the same power (assuming all else -- like prop balance, etc is equal).

I'm about to try using wooden props to see if the reduced mass will also reduce the magnitude of the reaction-torque pulses and therefore the levels of vibration. Some guys have had great success with this approach.