I was curious what the difference besides the CC rating on the King 48cc and 80cc engines. I know a big selling point was that there were no stampings or markings on the engine to tell what size it was due to legalities. Are they just bored differently? What is the piston diameter for a 48cc vs. 80cc? I wonder what the top end speeds are for both? I ordered the 80cc engine and I can get up to about 32Mph on flat ground running 25:1 fuel. I weight about 200 Pounds and my bike is prolly around 50 Pounds.