SECTION C35
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CLUTCH OPERATING MECHANISM
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The clutch is connected from the left handlebar
control to the clutch operating lever within the
gearbox cover. As the lever is withdrawn, the
clutch operating lever is lifted, exerting pressure
on a ball bearing against the end of the clutch
push rod. The push rod forces outwards the centre
of the diaphragm spring, relieving the pressure and
allowing the clutch plates to separate. For the
clutch to operate correctly, the degree of free
movement on the cable and clutch push rod must be
controlled. Excessive slack may prevent the clutch
freeing completely and excessively tight adjustment
will result in the clutch plates being held apart.
Adjustment is provided on the cable and push rod.
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Clutch Adjustment
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1
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Slacken cable adjustment at the handlebar
control as far as possible.
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2
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Remove the clutch adjuster inspection cap from
the chaincase.
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3
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Remove the inspection cap from the gearbox end
cover.
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4
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With the index finger, move the clutch operating
lever to and fro inside the gearbox cover to
establish whether or not there is slight movement.
If there is, clutch push rod adjustment is correct.
If there is not, rectify as follows.
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5
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Release nut (B) in Fig. C46 then turn the screw
(C) gently anti-clockwise until movement is felt on
the right side operating lever.
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6
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Turn screw (C) in a clockwise direction until it
is felt that the screw just touches the push rod.
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7
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Unscrew adjustment screw (C) one full turn and,
holding in this position retighten locknut (B).
This ensures the correct free movement on the
clutch push rod.
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8
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Adjust the clutch cable at the control to
provide 3/16 in. to 1/4 in. (4.76 to 6.35 m m) free
movement between the cable outer casing and
adjuster.
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CLUTCH PLATES
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The clutch dismantling procedure is covered as
part of Section C13 "Dismantling Primary
Transmission and Clutch." However, it is sometimes
considered necessary to remove the plates
separately for inspection.
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To gain access to the clutch plates, follow
Section C13 & C14 items 1 to 9. Next remove the
clutch pressure plate followed alternately by the
internal splined friction plates and external
splined plain steel plates.
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After removal, wash all the clutch plates and
the pressure plate in gasoline (petrol) until
perfectly clean, then allow to dry.
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Reassembly is a reversal of the foregoing but
full instructions are given in Section C33.
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Plate Inspection
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Examine the friction plates for obvious wear to
the splines and for "charring" of the surface such
as would occur during prolonged clutch slip.
Examine the plain steel driven plates for deep
scoring or grooving. Check the external splines for
obvious wear, and check each plate in turn on a
surface plate for flatness. Any badly worn or
distorted plates must be renewed before reassembly.
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