enya .09 and enya .19

hello, i need little help with information on these two engines, they are not mine but they are my freinds that knows a bunch about the larber displacement internal combustion engines like the ones in weed eaters, motorcycles and cars. But in the world of model internal combustion engines he does not know to much about them, as he has no experience with rc except a nitro car that would never start... He told me that on the side of the crankcase on both engines it says "Enya .19, and Enya .09'' i would be able to help him with info on these engines except for the fact that i have never owned a Enya engine of any size that is why im coming to you guys
Here is the picture that he sent me of the 2 engines...
http://www.gii.me/c/_1KDTFC?ak=a05sk1aNaL3ktf
thanks, MitchG95