A lower link for a piston crank mechanism of an internal combustion engine includes an upper section, a lower section, and a crank pin bearing section disposed between the upper section and the lower section, and mounted on a crank pin of a crank shaft. The stack has two air flow fields extending from an air inlet through an air turnaround manifold to an air outlet, the air outlet being adjacent to the fuel outlet. The component holder includes a multiplicity of component storages for storing the components therein are provided longitudinally and each has an opening on one surface. A pair of seals assists with sealing the chamber of the cabinet when the pair of doors is in the closed position.