well I am glad I got a more than a few responses on the two stroke Is a two stroke comment. Of course there are massive differences from mechanical design to thermodynamics to response to lubrication. Sure there's firing timing, advance. Then there's piston weight, conrod weight crankshaft stiffness and all the other things mentioned. That's why a DLE 20cc out performs some 26cc engines.Cream always rises to the top and I'll certainly agree that instant gratification and the desire to own more toys drives people to look for cheaper and cheaper options. Along the way, quality becomes distorted.