Abstract: An internal combustion engine comprising an engine block, a piston, a crankshaft, a lever, a piston connecting rod, and a crankshaft connecting rod. The engine block defines a cylinder chamber, and the piston is supported for reciprocating movement therein. The crankshaft is rotatably supported by the engine block and includes an eccentric portion. The lever includes first and second ends and an intermediate portion located therebetween, and the first end of the lever is pivotally connected to the engine block. The piston connecting rod includes a first end pivotally connected to the intermediate portion of the lever and a second end pivotally connected to the piston. The crankshaft connecting rod includes a first end pivotally connected to the second end of the lever and a second end pivotally connected to the eccentric portion of the crankshaft.