What is the max size of engine that can be fitted to an Enterprise dingy

[RunAgroundHard]

Have you looked at the stern of an Enterprise. Apart from the issue of not being able to attach the rudder, if try to mount in the centre the outboard clams would fall into the gap where the tiller goes through, below the mainsheet traveller.
so would need to be offset to the side.
As most have said, as small and light a 2 stroke as possible (or electric if budget permits)

Yes I have looked. I was following on from Refulers post. Enterprises have a fixed main sheet block on the stern as well, if not modified.

 

[Metalicmike]

The Enterprize is a two man sailing dingy and the transom is not designed to take the load of an outboard so even though the structure looks strong enough its attachment to hull may require strengthening.

 

[Biggles Wader]

You need something like this------

 

[Metalicmike]

A jet engine would give a better power to weight ratio