PRIMARY
DRIVE
SECTION
C3
ADJUSTING
THE
CLUTCH
OPERATING
MECHANISM
C
Remove
the
Inspection plate and gasket from
the
oUter primary chalncase,
to
allow access
to
the
clutch
operating
mechanism.
Very little
movement
Is
reGulred
In
the
clutch pull
rod
to
disengage
the
friction plate:
there
must
be a
clearance
of
approx.
0.002 In.
between
the
rear
face
of
the
large
adjuster
nut
and
the
ball
bearing
In
the
actuating plate.
If
too
much clearance
Is
allowed,
then It may be found Impossible
to
disengage
the
clutch.
On
the
other
hand,
If
excessive clearance
Is
present,
the
clutch friction plate will constantly
slip, and will eventually
burn
OUt.
ADJUSTMENT
Withdrawal
of
the
footrest
rubber
simplifies
removal
of
the
Inspection
cover
'A'
Fig. C3. which
provides access
to
the
clutch
operating
mechanism.
Completely slacken off
the
cable
adjuster
at
the
handlebar and also
at
the
chalncase
at
'A'
Fig. C2.
Extract
the
cable from
the
handlebar
lever.
Hold
the
sleeve
nut
M and release
the
small lock-
nut
R.
Stili holding
the
nut
M
stationary,
unscrew
the
operating
rod
P
with
a
screw-driver
until
the
clearance between the rear-face
of
the
sleeve nut
and
the
thrust
bearing (behind
the
nut)
Is
only
just
taken up, I.e.
the
rod
P has no end-play.
Re-assemble
the
cable, which
must
then
have
all
slackness removed by means
of
adjuster
A (Fine
adjustment only,
Is
provided
at
the
handlebar).
Now screw·ln
the
rod P
just
sufficiently
to
give a
P
Fig.
Cl.
Showing clutch
adjustment
trace of end play (0.002 in.) (0.012 mm) and tighten
locknut
R.
This end-play
Is
essential and will give
the
correct
amount
of
cable slackness
at
the
handlebar.
Adjustment of
the
clutch
operation
must
not
be
made
by
means
of
the
cable only.
The
above
sezuence
of
instructions
must
always be
followed.
Take
the
greatest
care
during
any
minor
cable
adjustment
at
the
handlebar,
that
In
the
process,
the
clutch
Is
not
partially
freed.
SECTION
C4
ADJUSTING
THE
PRIMARY
CHAIN
The primary chain
Is
of
the
duplex
type, and
Is
non-
adjustable, since
the
centres
of
the
engine malnshaft
and transmission malnshaft
are
fixed. Provision for
take.up of
wear
In
the
chain
Is
made by means of a
rubber
faced
slipper
blade, pivoted
below
the
lower run
of
the
chain.
The
free
movement
In
the
chain can be felt
with
the
finger,
after
removing
the
slotted
Inspection plug from
the
chalncase, with
the
ENGINE STOPPED.
To adjust, first apply
pressure
to
the
starter
pedal
by
hand,
to
remove
all slackness from
the
bottom
run
of
the
chain,
when
there
should
be
approx.
to
In.
(5
mm)
of
free
play in
the
top
run.
Fig. C3.
To reduce excessive slackness.
remove
the
sealing
c.over
A.
release
the
locknut
B,
and
screw
the
Fig.
C3.
Primary
chain
adjustment
C3
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