c
PRIMARY DRIVE
Remove the cutaway cover, vJlthdraw the chaIn-
wheel
assembly, and take off the engine
sprocket
(Fig. C7).
Assemble
the
p~'lmary
chain
to
both
sprockets
and
replace
as
a unit.
It
Is
essential that
the
twO
sprockets
are
fitted simultaneously and
that
the
chain
is
~ept
straight
during
the
whole
operation.
Tighten
the
engine
sprocket
securing nut, using a
new
locking washer.
Replace the spacer on the clutch mainshaft, and
then the securing
nut.
having
first
verified
that
the
011
seal
is
In
good condition. Ensure
that
the
seal
Is
not
damaged
by
the
thread
on
the pull rod. A
strip
of sellotape should
be
used,
as
previously
mentioned
in
Section C7.
For
torgue
settings for both engine
sprocket
and
dutch
malnshaft see page
GD
8.
SECTION
CI,Q
REFITTING
THE
INNER
PRIMARY
CHAINCASE
Removing
the
Inner primary chalncase
Is
covered
In
Section C7,
but
the
additional following Inform-
ation
Is
regulred during reassembly.
Clean
all
traces of old Joint washer and Jointing
compound
from both Joint surfaces.
Next
examine
the
dutch
shaft
011
seal for
cUts
or
other
damage.
The
old seal can be prlsed
out
with a
screwdriver-
this,
of
course, destroys
the
seal. A new seal
should
then
be fitted, with
the
spring side Inserted
first. Tap
In
evenly as far
as
possible, a little
at
a
time
with a light hammer.
If
the
needle race needs replacing, use a shouldered
drift
to
knock
out
both
the
race and seal
together.
Fit
the
new
race flush with
the
outer
surface, and
tap
In
the
seal from
the
back.
Check
the
condition of
the
gearshift cross shaft
bearing (needle roller) and of the all seal adjacent
to
It. These
are
mounted
In
a common housing. A
new
seal should be fitted with
Its
lip
outwards.
Examine
the
'0'
ring surrounding the
011
pump
(fitted
In
the
chalncase aperture), renewing as
necessary.
When
the Inner primary case
Is
replaced, fit a
new
gasket
over
the
crankcase Joint surface, greasing
this lightly
to
retain It. .
Tap
the
cover home with a hide hammer, until
the
spigot on
the
dutch
cover locates
to
the back
of
the
case. Take great care not
to
trap the
pump
0'
ring, otherwIse
the
cover must be removed again
and
the
seal renewed.
CB
r-ig. ca.
Items
1-7
socket
head
SCl'"ews,
B-hexagon
headed
bolt
(<it
In.
U H), 9 and
10
cross-headed
SCl"'ews,
11-bolts
to
en,gine
plate,
12-hexagon
headed bolt
(41
In.
U
H)
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