I am now back home
The zylinder sadly hasn't arrived yet but I hope it arrives soon.
My plans changed a little bit.
I am going to use a reed intake instead of the rotary as the rotary will not give me that big of an advantage over the reed and it is not worth the work.
Below I have 2 pictures of the zylinder that was on the engine previously, which was the first zylinder I ever ported a few years back. It was producing about 8.5 hp. It is a 63cc big bore zylinder for that engine.