Toincrease the displacement of a piston engine you buy a stroker kit but how can you do that in a rotaryengine?

In a rotary engine, you buy stronger better lighter parts, and add a turbo however there is more to it , Im assuming you are talking about a mazda engine. If you type " how to create horsepower in a rotart mazda engine ? " in your web search box, you will find a great selection of articles and information already available. All you need now is time , patience a little money a bunch of parts, tools and a lot of coffee