I was checking out Small Engine Warehouse and found these (possible) deals. If anyone has any info, maybe they would be a good way to go. Price is pretty good too.

Model EC08
78cc
3.3 hp @ 5500rpm
Dry weight 7.8lbs (Full dressed engine)
Cost $150

Model EC04
40cc
2.0 hp @ 7000rpm
Dry weight 7.7lbs (Full dressed engine)
Cost $125

What is their web address? Need to see some pictures.

http://www.smallenginewarehouse.com

Robin is made by Fuji Heavy Industies, the parent company of Subaru, you also see Robins sometime sold as Subaru Robin. Given that it is probably a damn fine engine.

http://cgi.ebay.com/2-0-RC-AIR-PLANE...QQcmdZViewItem

Hi, here is an interesting Subaru engine, 33cc, I came close to buying one. It has a float type carb. Thought you might want to look at it.