Diesel engine run: Webra Record 1.5cc CL/FF

My friend Nat gave me this engine which came to him in a lot of glow engines. It looked very clean, almost unrun, but had the hallmarks of frustration in the hands of a previous owner. The compression screw was bottomed out and the wear on the anodizing of the spinner suggested use of a starter. I ran the engine once, and afterwards thought that it got a bit tighter. The video starts with the subsequent run which includes a surprise... Enjoy!
Fuel: Aerodyne standard diesel fuel
Prop: 8x4
Not knowing the history of the engine, and since it looked like new, I'm following somewhat of a break-in process to be on the safe side.