Has anyone put a 4 stroke engine on one of these? I have a friend that is wanting to install a 4 stroke on his Diamondback Edgewood LS I am hoping we can put this kit on it. http://www.bicycle-engines.com/49cc-Complete-Stage-III-Gas-Powered-Bicycle-Engine-Kit.html he wants a clutch like what is on my bike so he dont have to use a pull start. This is the only kit for a 4 stroke I can find that you are able to do that with. If Im wrong Im sure someone will show me the error of my ways. Also any advice on a 4 stroke build Ill take with open arms.