Abstract: A supplemental filter for use in combination with a conventional annular air filter of an internal combustion engine. The supplemental filter in accordance with the present invention is for use in trapping hydrocarbon emissions. The supplemental filter includes a flexible cover which snugly envelops the conventional annular filter. Further, the supplemental filter includes means to effect sealing the flexible cover against opposite axial ends of the conventional filter. The supplemental filter further includes means, carried by the flexible cover, for distributing carbon media over a significant portion of the flexible cover.

Abstract: An internal combustion engine includes pressure relief devices that reduce pressure due to compression during startup, thereby decreasing the force needed to start the engine. A pressure relief valve mounts on top of the cylinder head and includes a duct to the combustion chamber leading to the valve and a second duct leading to the exhaust port so that gases in the combustion chamber may be vented through the exhaust system. A mechanical actuator having cables directed to each of the pressure relief valves for each of the cylinders manually actuates a first embodiment. A second embodiment includes a solenoid with wiring tied into a starter circuit that actuates the multiple valves from a single actuator.

Abstract: An internal combustion engine includes pressure relief devices that reduce pressure due to compression during startup, thereby decreasing the force needed to start the engine. A pressure relief valve mounts on top of the cylinder head and includes a duct to the combustion chamber leading to the valve and a second duct leading to the exhaust port so that gases in the combustion chamber may be vented through the exhaust system. A mechanical actuator having cables directed to each of the pressure relief valves for each of the cylinders manually actuates a first embodiment. A second embodiment includes a solenoid with wiring tied into a starter circuit that actuates the multiple valves from a single actuator.

Abstract: A method of modifying the cam drive arrangement of a motorcycle engine. The method includes providing an existing cam gear arrangement having a crankshaft sprocket connected to a primary camshaft sprocket with a chain, removing the chain, replacing each of the sprockets with a crankshaft gear and primary camshaft gear respectively, and engaging teeth of the gears so the crankshaft gear drives the primary camshaft gear directly. A specific method for modifying a TWIN CAM 88 engine, made by Harley-Davidson, according to this method, is also described.