Hi everyoneFirst of all i have a video about this project on my youtube channel. I think you should assemble it by watching the video.
I designed a 2 stroke engine model in this project. It can be almost completely printed with a 3d printer. (Just need bearings)Piston diameter 25 mm and stroke 25 mm. Thus, it has a cylinder volume of 12.25 cc. The bearings I use are 608zz type and have 8 mm inner diameter.
If you have any problems please leave a comment