The grey hound is a true 196cc Honda clone .. Even though it has some differences like 5 bolt valve cover and weird air box ... Then you have gen 1 which in my opinion are the best castings with bigger bore and more stroke but still maintaining a 25/24 valve setup the cam boss on all the non hemi motors is larger than Honda /clone then you have gen 2 and the hemi which has a Honda /clone cam boss and a kohler taper . gen 3 you have the non hemi some using larger valve heads and different retainers stock think they are labeled 3800 rpm