C
PRIMARY
BRIVE
SECTION
CI
PRIMARY
DRIVE
The
engine
unit
transmits
Its
power
output
from
the
crankshaft
sprocket
by
a duplex chain
to
the
clutch
chainwheel.
via a vane
type
shock
absorber,
to
a
slngle-pl,te,
diaphragm-spring clutch. Hence
the
power
is
delivered th rough
the
transmission
to
the
final drive
sprocket
and,
in
turn,
by
a heavy
duty
chain
to
the
rear
sprocket and wheel.
The
purpose
of
the
clutch
Is
to
provide
the
means
of
discon-
necting
the
fiaw
of
power from
the
engine
to
the
rear
wheel.
It
Is
not
necessary
to
remove
the
engine
unit
to
carry
out
work
on
the
primary
drive.
SECTION
C2
CLUTCH
CLUTCH
DESCRIPTION
A cast iron drive ring bolted
to
a pressed
steel
cover
encloses a driven plate, a
cast
Iron pressure plate,
and a diaphragm spring. The
latter
applies
the
clamping load
to
the
pressure plate.
The
drive ring
also carries
the
starter
ring gear.
The
clutch
Is
released
by
a pull rod, acting on a
ball bearing
in
the
centre
of
the
pressure
plate.
This
seperates
the
two friction surfaces, and allows
the
driven plate
to
revolve freely
between
them.
There
Is
no need
to
IIfree"
the
clutch
before
starting
the
engine.
MAINTENANCE
The
only maintenance necessary
Is
adjustment
of
the
clutch pull rod, (Section C3).
Whenever
the
primary
chai
n
is
removed, (see sections C7, Ce) It
may be advantageous
to
examine
the
clutch facings
at
the
same
tlme
,
to
ensure
that undue
wear
has
not
occurred,
because considerable work
is
otherwise
entailed
In
gaining access
to
these parts.
No
attempt
should
be made
to
lubricate any part of
the
clutch
unless
it
is
completely dismantled, since
there
would
be
a
ris~
of
oil contaminating
the
facings.
If
clutch
slip
or
drag
is
noticed, first check that
the
pull
rod
is
not
binding.
If
this
Is
satisfactory, it will be
necessary
to
strip
the
clutch and make replacements.
Note:-
Should
the
motorcycle be driven under
conditions
of
continued
slip,
the
heat generated could caUse
considerable damage
to
the
clutch unit.
Fig.
Ct.
Exploded
view
of
clutch
C2
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