Genie - Welcome to the Kitfox Forum. You will find lots of really good info here.

IMHO - I think you will find that a significant majority here will recommend the Rotax - either the ULS or the newer injected version.

We do have several members that have Lycomings and Continentals, so hopefully they will jump in here with their thoughts.

Mine is the 912ULS and I can't imagine a better engine for the Kitfox. Just my opinion.

Regards
Rodney Wren