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SDRVICE INSTRUCTIONS F'OR WIPAC
TYPE CJ
936
IN§TALLING
M,dGNEI'O
Slowly
turn
the
engine crankshaft in
the
normal
manrler
untii
the
piston
begins
to
rise
on the
cornpression
stroke
(i.e.
whea
both
valves
are ciosed).
Next
agaemblo
the
steel
floating couplinq on to
the
engine
coupling. Iiinally
take
the
magneto
and turn the
magneto
shaft
anti-clochwise
until the
impulse
pav.
enuages
the irnpulse stop, then siorvly
turn
the magneto shaft in the opposite
direction
until the
trvo driving
dogs
are
in
line
with
the
two
free slots
in
the
steel coupliDg
atrd
secure
the
magneto
in
position.
To
re-check
the
timing,
slowly
pull
the
engino
ovor on
the
cornpression
stroke, and
i{
the
magneto
has
been
correctly
positioned,
tho
magneto
impulse
will
give
a
click
jurt
before
top
dead centre.
TIMING
No
adjustment
is
provided
for
timing
the
magneto,
which
is
unnecessary,
ae
the magneto
ia
correctly
set
before
Ieaving
the
works, eo
that the
starting
sparl
occurr
just
before
top
dead centre
arrd
the
running spark
in
accordance
u'ith
details
on
Pages
Nos. 5, 6 and
7.
LUBRICATION
Tho only
part
requiring
attention
in
the
field
is the
canr
oil
pad which
should
be re-lubricated
after every
1,000
houre.
This
is
done
by
renroving
the
pad
and
squeezing
and working
into
it
a
Surnmer
grado
oI motor
trangmissiou
grease
which
will
closely resemblo
that
used
at
the
factory.
Do
not
uee
ordlnary
gtease
aB
thlo wlll
splash on
to
the
trreaker
polnts
cauelng
ml8flrlng
and
dlfflcult
startlng.
The
main
bc.aring
situated
at
tire
rear
end
of
the
magneto is packed
with
grease
before leaving
the
v'orks and
should
be
rertewed
oirly
u'henever
the
rnagneto
ie
servicecl.
'lhe flont
main
bearing
is
oil
impregnateci
and
slrr.ruld
only
require
a
fol'
rirops
of
lubri<;aring
oil
at
the
same
t
me.
Pacr
lt)
MAGNETO
IMPULSE
COUPLING
The
impulse coupling
is
designed to
give
a sparh
of high
density
for
starting.
It
automatically cuts
out at
about
165
r.p.m. 'fhe
engine
should
not be
run
continuously below
this
speed,
as
thio
would
cause unnecessary
strain
and
$,ear
on
the
impulse parts.
'IIte
impulse also provides
a
retarded
spark
for starting,
automatically
advanc-
ing
it
as
the
engine
speeds
up,
returning
to
the
retarded position when
tho
engino
Btops.
CLEANING
OF
IMPULSE
II the
inrpulse
becomes
clogged
with
dirt,
and
the
trip
arm fails
to
engage
or
disengage,
or
the
impulse
is
sluggish in
action,
it
should
be
Ilushed out
thoroughly
rvith
parafi&n,
taking
care
not to
ellow
any
paralfin
to
work
its
way
into
the
magneto housing.
BREAI(ER
POINT
OPENING
Itemove
cover
acrows
and
cover
to
obtain
access
to
the
breaker points.
Ihe
correct breaker
point
opening
ia
.015'.
When re-adjustrnent is
necessary,
loosen
the
screrv
*'hich
locks
tho
fixed
contgct plate and
raise
or lower the
plate
until the
correct opening
of
points h
obtained,
then lock the plate
recuroly.
REPLACEMENT
OT'
POINTS
BREAKER
The breaker
points
are supplied
ae
an
assembly
including
the fixed and movoable
point, the
die-cast
back plate and
oil
pad. To
rcmove
the
original
assembly
loosen
the
breakor
arm
apring
retainer
screw
and
release
the two
leads coming
from the coil and
condenser,
then
removc
the
trvo
screws
securing
tho
dio-cast back
plato
to
the main
housing.
When
fitting the
new
breaker point
assembly secure
the
die-cast
back
plato
in an
approximate position
and
adjuct
the
breaker
point
opening
to
'015',
then
slightlv
lnoceri
the
lrvo back
pl,ato
rcrawl
and
tuln
the plate
rvithin
its
slots
until
the
breaker pornts begiu
to
open
and
when
the rotor
larninations
itave
lelt
the
core
larninations
by
apitroximately
1l»'.
Finally
tighten
the
trvo
screws
ancl
reconnect
tl're
two
leads
{rorn
the
coil
and
condenser,
RDMOVAL
OF' CONDDNSII,R
'Ihe
condenser
is
housed
in the
base
of
the
main
housing immediatelv
below
the
breaker
points.
Remove
the
hexagon
nuts
securing
the
connecting
lead
and
earthing
strip.
Unscrew
the
condcnser
out
of its
housing, using
a
special
tool,
part
nurnber
00146,
but
before
doing
thie
it is
advisable
first to
rernove
the
magneto
cover
so that the
connectin(
load can
be
pushed
back
into
the
ruain
housing
out
of the way of the
tool.
REPLACEMENT
Or II,T.
LEAD
The
H.T.
Iead
is
secured
to
the II.T.
coil by
passing
the rvire
through
the
srna.'!l
hole
in
the coil
II.T.
tab
and twisting
the
rvire
around
this
tab.
When
rernoving,
or refitting a
new
H.T.
lead
exercise
the greatest
care
to
ensure
that
no
damagt
is
done
to
the
coil.
Never solder
the
FI.T. lead
to
the
tab
because
even
with
the
greatest
caro
it
is
possible
to
sever
the
internal
con-
nection. This
would
not
immediately
be apparent,
but
the
defect would
cause
the
coil
to
breali
down
within a
com-
paratively short
period.
RI'T{OVAL
OF COIL
Remove
covor and
H.T.
Iead.
Loosen
the
breaker
arm
spring retaining
ecrew
and
release
the primary lead.
Thon
remove
the two
hexaqon posts
holding
dos'n
thc
core
clarnps,
this will
also
releasc
tlie
earth prirnary
lead.
Turn
tho
magncto
shaft
until the
magnetism
no
longer grips
the coil
core
to the
main
housing,
pull
the coil
and
the coil
coro
froe.
hr
replacing
the
coil
and coil
core
bo
sure
that the primary earth lead
ia
fastened
under
the coil
coro
hexagon
posts
and the
insulated
primary
lead to
tl.re
breaker
arm
spring
rotaining
acrew,
Plcr
19
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