Kawasaki S2 (1972-1973) [49/129] Oil pump

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14 LUBRICATION SYSTEM The lubrication system used is the Kawasaki Superlube In this system oil is kept in a separate tank from which it is pumped to the engine by the oil pump and mixed with the gasoline The rate at which the oil is pumped which varies with the needs of the engine is controlled by engine ro tational speed and throttle opening With the ideal lubrication that results engine performance is vastly improved plunger spring pushes the plunger follower against the plunger In this manner the plunger is kept against the camshaft and as the plunger is turned its cam face riding on the camshaft causes it to reciprocate The follower which is joined to the plunger by a mortise and tenon like joint follows plunger movement turning and reciprocating to pump od Since there are two high points on the plunger face cam there are two complete pumping cycles for each single revolution of the plunger The rate at which oil is pumped depends on the speed of plunger rotation which varies with engine speed and on the position of the control cam which varies with throttle opening 1 Oil Passages b Plunger Cam Fig 173 is a diagram of the S Series Superlube oil passages The oil pump pumps the oil through check valves to the three banjo bolls behind the engine From there it is injected into the cylinder intake port to be mixed with gasoline A notch is cut into the big end of the connecting rod so that the gasoline oil mixture can reach the pin and bearing The pump lever is connected by a control wire to the throttle grip so that as the grip is twisted the set lever moves with it and turns the camshaft Oil Passages B A O U0tt 2 Oil Pump a Genera Construction and Operation Crankshaft rotational speed is reduced by the oil pump pinion on the right end of the crankshaft meshing with the oil pump gear on the oil pump shaft The other end of the shaft turns the pump When the lowest part of the control cam is facing the plunger as shown in Fig 174D tire plunger tip never touches the control cam and the cam on the plunger face can ride at point from its highest to lowest point the distance between the arrows Accordingly maximum plunger stroke occurs at maximum throttle opening In Fig 174C the motorcycle is idling with the throttle grip fully closed and the highest part of the control cam is toward the plunger When the plunger moves down the plunger tip hits the control cam and stops the plunger before it reaches the bottom of its cam thus preventing the plunger from making a full stroke At this time

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