A.J.S. 16MS, Instruction Book

Page: 42 / 94

The trip mechanism referred to allows the foot change lever to return to its normal
position, upon foot pressure being released, in readiness for the next change of gear.
Downward direction of movement causes engagement of higher gears and upward
movement with the toes causes a lower gear to become engaged.
As mentioned elsewhere an external marked disc shows at a glance which gear (or
neutral), is engaged.
The unusual method of clutch operation should be noted, the necessary thrust rod
movement to free being obtained through the medium of three balls operating on
inclined planes (see illustration 15).
Operation of the clutch handlebar lever moves clutch operating lever B causing inward
movement of the thrust rod by reason of the three balls mounting the inclined planes in
which they are located. The resulting inward movement of the clutch thrust rod forces
out the pressure plate, normally maintained in contact with the friction plates by the
springs E, thereby allowing the engine to drive the clutch sprocket D without imparting
drive to the mainshaft C.
Consequently no power is transmitted to the rear wheel, the clutch is said to be " out "
or " free." Upon releasing the clutch handlebar lever the clutch operating lever returns
to its normal position by the pressure of the spring forcing the balls down these inclined
planes thereby allowing the spring pressure through the medium of the pressure plate
to be transferred to the friction plates which causes the gear box mainshaft to revolve
and impart driving power to the rear wheel.
TO REMOVE KICK-STARTER CASE COVER FOR EXPOSURE
OF K.S., GEAR CHANGE A N D INTERNAL CLUTCH
ACTUATING MECHANISM
Remove oil drain plug and drain off oil contents of the gear box.
Remove the large oil filler plug and slack off the clutch cable adjuster sufficiently to
permit the cable end to be detached from the slotted end of the internal clutch operating
lever which is exposed by the removal of filler cap.
Unscrew the clutch cable adjuster until it is free from the K.S. case cover and withdraw
the cable nipple through the adjuster hole.
Remove the nut and small spiral spring securing small gear indicator disc from the cam
barrel spindle.
Next remove the five cheese head screws by which the K.S. case cover is secured to the
gear box end plate.
Withdraw the cover about ½ inch, holding the K.S. pedal firmly while doing so.
Now swing the K.S. crank round until it can be tied to the foot change lever. This
prevents the K.S. return spring unwinding and facilitates re-assembly.
The entire cover can now be removed
Re-assemble in exactly reverse order, taking care to avoid damage to the paper joint
gasket.
NOTE—The position of the various cheese head screws securing the K.S. case cover are
as follows :—
In the top position, screw measuring 3
8
inches under head.
In the bottom position, screw measuring 2
d
inches under head.
In the rear position, screw measuring d inch under head.
In the front position, top screw measuring 1 8 inches under head.
In the front position, bottom screw measuring 1 a inches under head.
TO REMOVE GEAR BOX END PLATE FOR EXAMINATION
OF GEARS
Remove K.S. case cover as already described.
Remove split pin securing both gear striker shaft pins and withdraw the pins and also the
cam barrel in which they operate together, with the spring loaded conical ended
plunger which engages depressions on the underside of the cam barrel.
Remove the mainshaft end nut and draw off the K.S. ratchet driver, pinion, spring and
bush upon which the pinion is mounted.
Remove the three cheese head screws by which the end plate is secured to the gear box
shell and the end plate is then free to be withdrawn leaving the gears and gear striker
shafts in situ.
Take care to avoid losing the steel ball fitted in the end of the mainshaft and interposed
between the clutch actuating lever and the clutch thrust rod.
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