Waco, I agree.
I know YS represents more maintenance and tunning time.

For instance, my Surpass started easily the very first time (with a counter-flipping to the spinner) once primmed with 4 -5 hand turns at WOT. And I still use the same procedure today. Never have to touch anything but the needle (and sometimes not even the needle).

That is the reason I am asking. If the power is the same, why bother to cope with complexity?

Thanks and regards.