Classic Cycles Technical Resources
51
When the throttle is closed, the lobe of the stop cam limits the down
stroke of the Plunger resulting in a short stroke. This short stroke of
the Plunger reduces the amount of oil pumped at idle.
As the throttle is opened, the Control Arm rotates the eccentric Stop
Cam so that the length of the Plunger's stroke is progressively
increased, resulting in an increased volume of oil being pumped to the
injectors.
OIL INTAKE
The diameter of the Plunger is slightly larger
than the diameter of the Differential Plunger.
The pumping action takes place in the area
surrounding the Differential Plunger in the oil
pump body.
As the plunger moves downward in the pump body, this area is increased in volume
and a partial vacuum is produced. The rotation of the plunger (as it moves
downward in the pump body) allows the inlet hole in the plunger to align itself with
the Oil Inlet leading from the supply tank. This is drawn up through the Plunger
and out the hole in its top and into the areas surrounding the Differential Plunger.
OIL DISCHARGE
When the rotating Plunger moves UP in the oil pump body,
the area surrounding the Differential Plunger is decreased
in size and the compressed oil re-enters the hole in the top
of the plunger and is discharged through the left or right oil outlet. The rotation of
the Plunger has aligned the oil outlet port in the Plunger with an oil outlet in the
pump body. These outlets are located 180E apart in the pump body and are ducted
to the oil line fittings on the front of the pump.
The timing of the alternating alignment of inlet and outlet ports in the Plunger is
predetermined by the cam-shaped lower end of the plunger.
It is thus seen that oil pump output volume is regulated both by crankshaft speed
and throttle setting.
B. Adjustment
The entire oil injection system is designed to provide the correct oil mixture at all speeds.
The only adjustment it will ever need is the cable adjustment. The oil pump volume is
affected by the position of the throttle and varies from 20 to 1 mixture at full throttle to
100 to 1 at idle. To adjust the oil pump control cable proceed as follows:
1. Remove left carburetor cover.
2. Turn throttle grip to maximum open position.
3. Check the oil pump control arm (where the cable is connected) and note the pin in the oil
pump body and 2 stops on the control arm. (Fig. 107). At the maximum open throttle
position the stop should be within c inch of the stop pin. If the stop clearance is open
more than c inch or the stop is closed against the pin, adjustment is necessary.
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