Actually, OSMax suggests in some of the 4stroke manuals that their engines that do not have chokes will start best with electric starters. That suggest they know how hard it's going to be trying to hand start them. Especially when the engine is inside the cowl and can't be finger choked.

OK, the subject of this thread is what's different about 4strokes. With the design of most, if you cowl them in completely as the majority of our models do, the location of their intakes are going to be completely out of reach. Totally inaccessable. No way to finger choke or to squirt prime into. And if you plan to get the cylinder really wet inside you best figure out something special to do that trick.
However, if you've got the engine upside down inside that cowl, you could just run your electric starter for awhile, and the delivery pipe will provide all the wet cylinder you could desire. (newbies, that actually is a joke, don't plan on that doing anything other than flooding the sucker)

As it is with one of my OSMax's, the OS manual suggests if you plan to have the engine inside a cowl, the way to get it cranked without a prime or any ability to choke it, would be to hook up your starter battery, and simply apply an electric starter. They tell you that in their manual. And it works great. It didn't work too great with that engine for me until it was broken in and the needle settings were set. But it did work ok then. And until it was adjusted, while it was upside down and not broken in, it was a witch to get the sucker started without flooding it.