Dear Captinjohn

My point is (or was) that usually when you do a conversion,no
matter how well done, is not as good as a piece of equipment
that was designed from the "ground up" to do that same job.

An adapter is an adapter no matter how you look at it.
I'll admit that many of the conversions work ,and work
well. A big bang for the buck, but not nearly as good as a
(ground -up design)motor that was designed to spin only
a prop within a specific range.

Kris was very correct about some of the engines (wackers, etc)
out there. My point there was if you would't break in your
trimmer then why would you break in the same motor that is
converted into aircraft use other than to see if it will still run ?

I must be missing something,

Regards
Roby