Abstract: An internal combustion device is provided for starting a parent engine, the device having a frame having a piston in a cylinder forming a combustion chamber, the frame further having an air passage and a fuel passage for receiving air and fuel into the combustion chamber. A rod connects the piston to a gear train, the gear train being operationally connected to a crankshaft of the parent engine. An ignition mechanism is operationally connected to the combustion chamber for initiating a combustion process using the received fuel and air within the combustion chamber. The piston is driven one power stroke, causing the crankshaft of the parent engine to rotate. A fuel subsystem utilizing a conventional, replaceable compressible fuel canister. Air forced from the cylinder on the piston is routed to the combustion chamber for purging the combustion chamber of spent gases, and mixing with subsequent fuel gas entry.