OK, I dug out an Enya 60 III. THis engine is a ringed, loop scavenged motor that should be fairly representative of a typical late 60s choice for power. Should be on par size and weight to the Tigre and Gold Head OS.

Measured weight is 420 grams or 14.75 oz. This is certainly light, but still 3/4 oz heavier than the Evo and OS 55AX. Lugs are drilled (from the factory) for 8-32s. Interesting to note that the crankshaft is a size in between the 46 diameter crank in the Evo/OS 55 and the large crank in the 61SF. Also interesting is the carb venturi on the Enya is even smaller than the Evo/OS 55. Case size shows the Enya is overall much closer to the Evo and OS 55 but still a bit larger. You can see what I am talking about with the pics.

I still stand pretty amazed at these new large displacement/small case motors coming from the manufactures. I have to believe that they make good power for thier size and weight. Can't wait to run them this Spring!

Sean

pics are a side-by-side of the Enya 60 vs Evo 60, #2 pic is a comparison from the back, #3 is the Enya 60 in the middle of the Evo and OS 55