My engine ran at 8-9000 rpm with 12x6. But i was afraid to lean out fuel in case not enough lubricating the engine. Because i used motor oil at sae10W40 in dieselfuel. Castor oil are expensive here in Norway. Which oil can i use in dieselfuel for 4 stroke engine? Full syntetic motorcycle oil at 20W50?

The combustion chamber are not same as in Bukh diesel or in Mercedes diesel, both engines has injector above comustion camber. I use the "lanova cell" with contrapiston.. and it is too cause to difficult to place contrapiston direct in cylinderhead. fuelmixture presses in the cell and ignite, then blow out of cell..

Lanova cell. A special combustion chamber also called energy cell, for diesel engines of high rotary speeds.

I shall send better pictures of engine parts. Here are not much carbon builds up in combustion camber and piston![X(]