Rolf R Bakke | My DIY 4-stroke engine first run @RolfRBakke | Uploaded June 2016 | Updated October 2024, 15 hours ago.
Made of random scrap found at work.
Designed with the well known engineering principle called "TLAR".
About 50cc, compression ratio: a whopping 2.4:1 :)
Runs on propane from that plastic bag :)