Its a 40cc Echo.
Might have been my response in that thread.I have an original new prop hub and the spec sheet [sales pamphlet].
This was from a person in Ohio that had an engine,hobby shop combo.I know of one person here in the conversion forum that has one also.
Gibbs Hobby and Reaserch was the name.He custom converted Echo engines.
If ya need any help.hollar.