Abstract: A chain saw kit having a sub-frame assembly and a plurality of operating components, including at least a battery operated motor and battery. The sub-frame assembly is configured to define mount locations for the operating components so that the sub-frame assembly and operatively placed operating components make up at least a part of a main operating unit to which a chain bar and cutting chain can be assembled. A first outer housing assembly has at least a first outer housing part with a second outer housing assembly having at least a second outer housing part. The parts of the outer housing assemblies are interchangeably usable to allow selection of different overall size, shape, and/or appearance of chain saws based upon a common sub-frame assembly.

Abstract: A chain saw unit has a sub-frame defining a plurality of mount locations and a plurality of operating components including at least: a) a battery operated motor; and b) a battery for operating the motor. The plurality of operating components is each operatively placed and maintained at one of the mount locations such that the sub-frame assembly and operatively placed operating components together make up at least part of a main operating unit to which a chain bar and cutting chain can be operatively assembled. The main operating unit has an exposed surface area. An outer housing assembly overlies the exposed surface area and defines an outermost exposed surface. The plurality of operating, components are operatively maintained on the sub-frame assembly independently of the outer housing assembly.

Abstract: A portable battery-operated tool has a frame on which there are a working component, a drive, and a battery assembly. The battery assembly consists of a battery with at least a first electrical connector and housing with at least a second electrical connector. The battery is movable guidingly between first and second positions. With the battery in the first position the at least first electrical connector is electrically engaged with the at least second electrical connector. With the battery in the second position the at least first electrical connector is electrically disengaged from the at least second electrical connector so that the battery is not powering the drive to allow the drive to be operated. The battery assembly further has a locking assembly through which the battery is selectively releasably fixed in the second position.

Abstract: A portable battery-operated tool having a frame on which there are a working component, a drive, and a battery assembly. The battery assembly consists of a battery with at least a first electrical connector and housing with at least a second electrical connector. The battery is movable guidingly between first and second positions. With the battery in the first position the at least first electrical connector is electrically engaged with the at least second electrical connector. With the battery in the second position the at least first electrical connector is electrically disengaged from the at least second electrical connector so that the battery is not powering the drive to allow the drive to be operated. The battery assembly further has a locking assembly through which the battery is selectively releasably fixed in the second position.

Abstract: A mounting assembly for a marine propulsion system includes a horizontal mounting plate, a pivot housing, and an adapter plate attached to one another through a plurality of vibration absorbing isolation points. The adapter plate is configured for attachment to an outboard powerhead, and the horizontal mounting plate is configured for horizontal attachment to a boat platform. The pivot housing is configured for attachment to a steering arm that extends through the horizontal mounting plate for rotating and pivoting an attached steering arm yoke and trunnion assembly and propeller drive unit. A contoured opening in the horizontal mounting plate facilitates drop down installation of a marine propulsion system.

Abstract: A steering arm yoke and trunnion assembly for a marine propulsion system includes a steering arm and a yoke including integral fluid paths for trim actuator fluids and for cooling water for an outboard powerhead mounted to a horizontal mounting plate within a platform extending from a boat hull. The steering arm and yoke include a drum extending through the horizontal mounting plate for rotating an attached propeller drive unit. The fluid paths extend through the drum, which is rotatably mounted to the horizontal mounting plate. The yoke includes pivot arms for attachment to a trunnion that includes actuator brackets for trim actuators fluidly connected to the actuator fluid paths of the drum.

Abstract: A marine propulsion system includes an outboard powerhead mounted to a horizontal mounting plate within a boat platform recess. A steering arm is attached to a yoke that extends through the transom plate for rotating an attached propeller drive unit. The yoke includes integral fluid paths for hydraulic cylinders coupled to the yoke to pivot the propeller drive unit, and for powerhead cooling water. A removable gearcase plate allows the outboard powerhead, the horizontal mounting plate, the steering arm and the yoke to be pre-assembled and dropped down through the boat platform recess.

Abstract: A gear shift mechanism for a marine propulsion system includes a reversible DC electric motor, a sliding clevis, and a shift rod for actuating a gearset within a gearcase between forward, reverse, and neutral positions. The mechanism is housed in a watertight gear shift cover that is attached to a trunnion that, in turn, attaches to a top surface of the gearcase. Electronic, logic driven controls reverse the polarity of the motor to manipulate the shift rod via the sliding clevis to shift the gearcase into a selected operating position.

Abstract: A cylinder block for an internal combustion engine includes a mounting surface having therein a crankcase cavity and a pair of cylinders respectively extending from the cavity in acute angular relation to each other and each including a cylinder wall. The cylinder walls include outer ends having cylinder head mounting surfaces, mixture transfer ports, mixture supply ports, gas discharge ports and a main exhaust gas discharge passage. A passage communicates between the exhaust gas discharge ports and with the main exhaust gas discharge passage. Mixture supply passages extend between the mounting surface and the cylinder head mounting surfaces and include reed valves. Branch passages communicate between the transfer ports in the cylinder walls and the mixture supply passages at respective locations between the cylinder head mounting surfaces and the reed valves. Auxiliary supply passages extend from the mounting surface and communicate with the mixture supply ports in the cylinder walls.

Abstract: Disclosed herein is a four-stroke internal combustion engine comprising a common crankcase, a crankshaft extending in the crankcase, first and second cylinders respectively extending from the common crankcase in acute angular relation to each other and respectively including first and second cylinder walls respectively including first and second exhaust gas discharge ports, a passage connecting the first and second exhaust gas discharge ports, first and second pistons respectively located in the first and second cylinders and respectively connected to the crankshaft for reciprocating movement toward and away from the crankshaft and between top dead center and bottom dead center positions, first and second cylinder heads respectively connected to the first and second cylinders, respectively partially defining first and second combustion chambers, and respectively including first and second mixture inlet passages respectively communicating with the first and second combustion chambers, first and second exhaust

Abstract: An outboard motor comprising a lower unit including an outer housing and an inner exhaust housing mounted within the outer housing, the inner exhaust housing defining an exhaust chamber, the upper end of the inner exhaust housing having therein spaced first and second exhaust inlets, and the inner exhaust housing also including a first exhaust pipe having an upper end communicating with the first exhaust inlet and having a lower end communicating with the exhaust chamber, a second exhaust pipe having an upper end communicating with the second exhaust inlet and having a lower end communicating with the exhaust chamber, and a connecting exhaust pipe having opposite first and second ends respectively communicating with the first and second exhaust inlets, the connecting pipe being open only at the opposite ends, and a two-stroke internal combustion engine including first, second, third and fourth cylinders and first, second, third and fourth exhaust gas ducts having respective first ends communicating respective

Abstract: An internal combustion engine comprising an engine block defining a cylinder bore and including an exhaust passage communicating with the cylinder bore, a cylinder liner which is housed in the cylinder bore and which includes an exhaust port communicating with the engine block exhaust passage, and structure on one of the engine block and the cylinder liner for permitting one of the engine block and the cylinder liner to expand adjacent the exhaust port.

Abstract: A marine propulsion device comprising an engine including an exhaust outlet, a lower unit including a high-speed exhaust outlet and a rotatably mounted propeller driven by the engine, a generally vertical conduit communicating with the high-speed exhaust outlet, a wall surrounding the conduit and defining a water jacket between the wall and the conduit, the water jacket including a lower portion filled with water, a foward portion, and an exhaust gas inlet located above the level of the water and communicating with the engine exhaust outlet, and an adaptor connecting the engine to the lower unit, the adaptor including a first passage communicating between the engine exhaust outlet and the conduit, a port located forwardly of the passage and communicating with the forward portion of the water jacket at a point above the level of the water in the water jacket, a low-speed exhaust cutlet located rearwardly of the first passage, and a second passage extending interiorly of the adaptor and communicating between th

Abstract: This invention provides a control for regulating the throttle and spark timing of a spark ignition internal combustion engine having an operator controlled device, a fuel/air mixing device, and a spa LN