Does any one have any observation on the 4 stroke weed trimmer engines? The one that makes my liver quiver is the Shindaiwa that mixes the oil in the gas rather than having a crank case oil resivoir.

I'd like to build a 1/4 Cub and go gas but prefer the sound of a 4 stroker and the Shindaiwa scheme might allow for an inverted installation.

Any thoughts?