Abstract: A method of manufacturing a cylinder head and crankcase for a small engine. A crankcase and a cylinder head are cast to close tolerances and include as-cast mounting flanges, which are assembled in face-to-face contact by employing self-threading screws. Bearing recesses are cast into the crankcase. The cylindrical sidewalls of the bearing recesses are provided with as-cast flutes and roller bearings are press-fitted into the bearing recesses.

Abstract: A method of manufacturing a cylinder head and crankcase for a small engine. A crankcase and a cylinder head are cast to close tolerances and include as-cast mounting flanges, which are assembled in face-to-face contact by employing self-threading screws. Bearing recesses are cast into the crankcase. The cylindrical sidewalls of the bearing recesses are provided with as-cast flutes and roller bearings are press-fitted into the bearing recesses.

Abstract: A method of manufacturing a cylinder head and crankcase for a small engine. A crankcase and a cylinder head are cast to close tolerances and include as-cast mounting flanges, which are assembled in face-to-face contact by employing self-threading screws. Bearing recesses are cast into the crankcase. The cylindrical sidewalls of the bearing recesses are provided with as-cast flutes and roller bearings are press-fitted into the bearing recesses.

Abstract: A method of manufacturing a cylinder head and crankcase for a small engine. A crankcase and a cylinder head are cast to close tolerances and include as-cast mounting flanges, which are assembled in face-to-face contact by employing self-threading screws. Bearing recesses are cast into the crankcase. The cylindrical sidewalls of the bearing recesses are provided with as-cast flutes and roller bearings are press-fitted into the bearing recesses.

Abstract: A piston and split piston ring assembly having a piston ring locator to prevent substantial rotation of the piston ring in a ring groove. A notch is provided in a wall of the ring groove and an abutment pocket is formed by the ends of the split piston ring. The piston ring locator is a flattened wire clip within the groove between the piston ring and the wall of the groove. A segment of the clip is displaced into the notch and another segment is displaced into the pocket.

Abstract: A piston and split piston ring assembly having a piston ring locator to prevent substantial rotation of the piston ring in a ring groove. A notch is provided in a wall of the ring groove and an abutment pocket is formed by the ends of the split piston ring. The piston ring locator is a flattened wire clip within the groove between the piston ring and the wall of the groove. A segment of the clip is displaced into the notch and another segment is displaced into the pocket.

Abstract: A portable, work prooducing apparatus is powered by a single cylinder, two-stroke, internal combustion engine made substantially from aluminum. An exhaust port defined through a wall of the cylinder has inserted therein a steel sleeve with dimensions smaller than the exhaust port to create an air gap between the sleeve and the walls of the exhaust port. A muffler is fastened directly to the cylinder at the exhaust port. Fastening of the muffler acts to press the flange of the sleeve against the exterior of the cylinder, thereby retaining the sleeve within the exhaust port without additional fasteners and creating a good seal with the muffler. The steel and air insulate very hot exhaust gases from the cylinder to prevent overheating of the air-cooled cylinder in the area around the exhaust port that causes premature failure of lubricant and wear of the engine components.

Abstract: A system for controlling the movement of hydraulic fluid through the fluid containing chambers of a hydraulic cylinder operatively connected between a marine vessel and its outboard drive unit includes valves disposed within the cylinder to restrict the flow of fluid between the fluid chambers and a bypass for allowing unrestricted flow of fluid between the fluid chambers. The system includes a trim valve to allow limited flow of fluid in a first direction of piston movement and a tilt valve to allow unrestricted flow of fluid between the fluid chamber of the cylinder. A velocity sensing valve is provided to sense and prevent rapid upward movement of the drive unit.

Abstract: A locking device (15) for preventing loosening of the clamp screw (13) and removal of the clamp bracket (11) of an outboard motor from the transom (10) of a boat. The locking device (15) has a tubular member (16) with holes (20, 21, 22) to accommodate the clamp handle (14), an arm of the clamp bracket (11), and a padlock (17). The tubular member (16) fits coaxially over the clamp screw (13) to protect the screw.

Abstract: A recoil starter mechanism (10) mounted in axial alignment with the flywheel (12) of an internal combustion engine has a drive plate (16) with clutch teeth (34) which moves axially when rotated to engage clutch teeth (17) on the flywheel and rotate the flywheel (12) to start the engine. The drive plate (16) is driven axially and rotationally by ramps (30) on the starter pulley (14) when the starter rope (24) is pulled. A brake plate (18) frictionally engaging the starter housing (13) has arms (37) engaging the drive plate to resist rotation of the drive plate (16), thereby forcing the drive plate to move axially as the starter pulley (14) is rotated.

Abstract: Marine drives having water cooled engines utilize a water pump mounted over the drive shaft and internal to the drive shaft housing to provide engine cooling, the pump having stamped metal housing parts and a flexible impeller.

Abstract: An air and fuel induction system for a two cycle engine having two adjacent horizontal cylinders positioned aligned one above the other and each having a separate closed crankcase includes a single horizontally positioned carburetor having a single metering system for supplying an air and fuel mixture to both cylinders. An induction passageway for each cylinder connects between the carburetor and each crankcase. Each induction passageway has an opening at about the same elevation and each opening has about the same cross sectional area. A reed valve is positioned adjacent the carburetor throat and at the entrance to each of the induction passageways. The reed valve includes at least one flat reed positioned directly across and closing the opening to each of the induction passageways.

Abstract: The invention contemplates an improved ported cylinder construction and method wherein the precision of die-casting is used in the separate construction of a cylinder body and of a cylinder liner wherein ports and grooves are so formed in these parts as to cooperatively define inlet and exhaust passages, upon correctly registered assembly of the ports. In the specific form disclosed, the assembled cylinder provides for side-ported exhaust and an array of inlet-mixture passages for communicating a crankcase-compressed combustible charge to liner-bore regions selected for best scavenging of exhaust products.