Had to run out to the garage to get some pumpkin for the pie Thursday so took a quick look at the front of the Wisconsin motor. It does have a notch in the outside of the belt pulley for a rope. If the Wisconsin pulls a hard as my Briggs does I don't think I want to be rope starting it with size pulley. My 10 hp Briggs has about a 3" rope winding pulley and it pulls fairly hard. I really don't see using the belt pulley for a rope start. At least not in my corner of the ranch.
Okay, so you found the notch in the pulley on the motor. Good. It's not that hard to turn that Wisconsin over with the rope so you'll be fine with it if you need it.