I'm building my first bike using a phantom tank frame and want to fit a 2 stroke motor kit . I'm in the Uk and don't really want to ship an engine from the states as there are some on eBay from uk sellers.but they seem to state that you have to have a minimum 26" rear wheel .im sure I've seen plenty of builds with 24" wheels so is there a certain kit I need and what's the best rear sprocket size to get .