I have a brillelli 26cc SS engine in my 10lb 7 oz Jerry's Big Boy (84 inch WS) and with a 18x6 it has (for all practical purposes,) unlimited vertical and very smooth idle and transitions. The new Brillelli 26ssr is supposed to be even stronger. I have a G-26 modified by Cunningham in a Kange Monocoupe and power is very good, maybe ( maybe) stronger than the Brillelli It is heavier. I like the sound ofthe G-26 better but I plan on sticking with Brillelli Engines as long as they offer sizes I need. Their service and support is UNBEATABLE. I had the 26cc for over a year without taking it out of the box. When I started to use it... it would not draw fuel. Scott@ Brillelli sent me areplacement carb at no charge, not even postage. And the motor had been out of warranty for months. BTW ,Cunningham was great too.
Mike