Instruction manual

If, to remedy clutch slip, it is necessary to screw nearly home the five nuts, this is a clear

indication that, either the clutch springs have lost their strength, and/or, the fabric

inserts in the clutch friction plates have worn so that they are past further useful service.

In which case, replace with new.

The standard setting of the clutch spring adjusting nuts is obtained by fully tightening

all five nuts and then unscrewing each exactly four complete turns.

CLUTCH ADJUSTMENT

Minor adjustment of the clutch operating mechanism is obtained by screwing, in or out,

the clutch cable adjuster located in the back of the kick-starter case.

Major adjustment of the clutch operating mechanism is obtained by altering the position

of the fulcrum pin of the clutch operating lever in the kick-starter case. (Lever A in

Illustration 17 and 175-X-4 in Illustration 18.)

The Major adjustment is explained below.

175-X-4 is the gear box clutch operating lever, and 66-X-7 is the pin on which it hinges.

329-X is the operating lever fork and this slides in the kick-starter case cover, its position

being determined by the sleeve nut 331-X,

Cap 328-X is secured to the outside of the kick-starter case cover, being fixed by the

two screws 333-X and acts as a locking device for the sleeve nut 331-X.

It is essential that there is about Q" clearance between the operating plunger 330-X

and the nose on operating lever 175-X-4 when the clutch is in the engaged, or driving,

position. This clearance is easily checked by removing the filler cap when it should be

possible, with finger pressure only, to move the clutch withdrawal lever 175-X-4, the

top end of which lies just beneath the filler cap orifice, about W" to and fro. This

amount of free movement at the extreme tip represents approximately the clearance of

Q " specified above.

It will be appreciated that, as the result of wear on the fabric inserts in the clutch friction

plates, the plates will tend to close up towards each other. This increases the effective

length of the clutch thrust rod. On the other hand, the clutch control inner wire tends

to stretch in use. These two actions will neutralise each other but the fact remains that,

from time to time, it is necessary to adjust the rod clearance and also take up cable stretch.

Clutch slip caused by the clutch thrust rod permanently bearing on the spring pressure

plate will rapidly ruin the fabric inserts and thrust rod. In addition, the heat generated

by this may be so intense that the hardening of the clutch springs and the two ends of

the thrust rod may be adversely affected.

Therefore, the importance of correct adjustment, and inspection of same to see the

adjustment is maintained, must be stressed.

Obtain adjustment of clutch mechanism by :

Remove the two screws 333-X.

Take away the cap 328-X.

Adjust the sleeve nut 331-X as may be necessary, as follows :

To increase clearance between clutch operating lever 175-X-4 and operating plunger

330-X, turn sleeve nut in a right-hand, or clockwise, direction.

To decrease clearance between clutch operating lever 175-X-4 and operating plunger

330-X, turn sleeve nut in a left-hand, or anti-clockwise, direction.

One or two turns should be ample.

Replace cap and screws.