There have been a few threads recently on the Duropower engines. I have two of them with the gearboxes designed for scooters/skateboards and while they run great the metal quality is somewhat suspect. I have been looking at their 50cc 4 stroke as a possibility for the 1/3 scale pup. I can't seem to find any info on this engine. Has anyone seen one? It looks like it might be a scaled up version of a Honda GX series, inverted mounting is the most important thing to me.

http://www.duropower.com/item.asp?PID=88&FID=3&level=1