I have a wankel of my own. You need the type r plug from OS for the wankels. Second and most important you need to use fuel that has 22-25% oil minimun or you will burn them up. They liked to be choked as well when trying to start them. Choke the carb and flip it over by hand a few times to get it primed and use an electric starter. They like to be spunup by the starter kinda fast when starting. Another tip is they like to drink fuel as well. I have burned through a 12oz tank on the test stand in about 5 min at full throttle. If you wnat to get rid of them let me know.